Sunday, January 25, 2009

Ocean Fertilization Experiment off Antartica Is Halted

An article in the Telegraph reports that a planned experiment to dump 20 tons of iron sulfate into the Southern Ocean to create a 186-square-mile plankton bloom to soak up the greenhouse gas carbon dioxide from the atmosphere has been stopped by the German government because of concerns that the experiment violates the UN’s Convention on Biodiversity. This should bring relief to environmentalists who have been worried that this large experiment could have resulted in an ecological disaster. The Polarstern, the German research ship carrying the iron, left South Africa with scientists on board from Germany, India, and the UK about two weeks ago. About one week later the experiment was placed on hold by the German government so that a group of international scientists could review it. It appears now that this global warming geoengineering experiment has been terminated before the review was completed.

Wednesday, January 21, 2009

Bill McKibben Asking People to Join Civil Disobedience Action at Washington, DC Coal Plant

Al Gore said last fall that "If you're a young person looking at the future of this planet and looking at what is being done right now, and not done, I believe we have reached the stage where it is time for civil disobedience to prevent the construction of new coal plants that do not have carbon capture and sequestration," and now author and climate activist Bill McKibben has issued a statement asking for volunteers to join a massive civil disobedience action at the Capitol Power Plant in the District of Columbia on Monday, March 2. According to Wikipedia this coal-burning plant supplies steam and cooled water to the Capitol Building and its surrounding complex. The last time is supplied electricity to the Capitol Building was in 1952. In 2006 the plant put out 60,000 tons of carbon dioxide emissions. Although the plant is only about 1/100 the size a typical coal-fired power plant it has the reputation of putting out a large amount of nasty particulate matter, the size of which is especially harmful to humans. The civil disobedience action is being timed to coincide with a large meeting in DC of the youth climate movement PowerShift ’09. In an e-mail McKibben writes the following:
There are moments in a nation's--and a planet's--history when it may be necessary for some to break the law in order to bear witness to an evil, bring it to wider attention, and push for its correction. We think such a time has arrived, and we are writing to say that we hope some of you will join us in Washington D.C. on Monday March 2 in order to take part in a civil act of civil disobedience outside a coal-fired power plant near Capitol Hill.
Coal-fired power is driving climate change. Our foremost climatologist, NASA's James Hansen, has demonstrated that our only hope of getting our atmosphere back to a safe level--below 350 parts per million CO2--lies in stopping the use of coal to generate electricity.
The industry claim that there is something called "clean coal" is, put simply, a lie. But it's a lie told with tens of millions of dollars, which we do not have. We have our bodies, and we are willing to use them to make our point. We don't come to such a step lightly. We have written and testified and organized politically to make this point for many years, and while in recent months there has been real progress against new coal-fired power plants, the daily business of providing half our electricity from coal continues unabated. It's time to make clear that we can't safely run this planet on coal at all. So we feel the time has come to do more--we hear President Barack Obama's call for a movement for change that continues past election day, and we hear Nobel Laureate Al Gore's call for creative non-violence outside coal plants.
Our goal is not to shut the plant down for the day--it is but one of many, and anyway its operation for a day is not the point. The worldwide daily reliance on coal is the danger; this is one small step to raise awareness of that ruinous habit and hence help to break it.
With about half of the electricity in the US coming from burning coal and projections that electricity demand will be soaring breaking the coal habit is going to be difficult.

Monday, January 19, 2009

Global Warming About to Claim Another Antarctic Ice Shelf

According to an article in Reuters, scientists have found that the Connecticut-sized Wilkins Ice Shelf is now attached to the Antarctic Penninsula by a strip of ice that is only slightly more than 500 yards at its narrowest point. About 60 years ago the strip measured about 60 miles in width. Glaciologist David Vaughn says that the demise of the ice shelf is imminent. This will be the tenth Antarctic ice shelf lost to global warming that scientists have recorded. If an ice shelf is preventing ice sheets on land from speeding up and sliding into the ocean then the loss of an ice sheet can have serious consequeces as ice sheets enter the ocean and raise sea levels. Because the Wilkins Ice Shelf is not holding back ice sheets this current situation does not raise this concern. If all the ice from Antarctica melted sea level would be raised by nearly 200 feet. That may seem improbable within the next millineum but according to Purdue University climate scientist Matthew Huber in an article on the nzherald website if greenhouse gas emissions are not curtailed the levels of carbon dioxide would be high enough to melt the Greenland and Antarctic ice sheets within 100 to 200 years. At the lower end of that range some babies alive today would be expected to witness this total melting of ice in their lifetime.

Friday, January 16, 2009

Iron-Dumping Ocean Fertilization Experiment Placed on Hold

Although the German ice breaker Polarstern continues to steam toward the Southern Ocean to carry out an ocean fertilization experiment by dumping 20 tons of ferrous sulfate into the waters of the Scotia Sea near the Antarctic Penninsula, whether the experiment is actually performed is now in doubt. According to a report in the Mercury, the pleas of several international environmental NGOs to stop the experiment has resulted in the German government organizing an independent review of the experiment by international scientists. The results of this review will determine whether or not the iron gets dumped. The purpose of dumping the iron is to produce plankton blooms which will pull carbon dioxide out of the atmosphere to combat the carbon dioxide emissions problem which is a main driver of global warming. One of the NGOs which is opposed to the experiment is the ETC Group. Jim Thomas of this organization says that carrying out this experiment “will be a clear defiance of the UN Convention on Biological Diversity.” This agreement, which placed a global moratorium on ocean fertilization activities because of ecological risks, was signed in May 2008 by 191 countries. Whether this experiment is actually stopped should be known soon. The head of public relations for the German research institute that owns the Polarstern told the Mercury that they hoped that an answer would come from the scientific review within one week.

Thursday, January 15, 2009

Scheme to Cool the Earth with Sunlight Reflecting Crops

Forget about increasing the reflection of sunlight to slow global warming by launching mirrors into space or dispersing sulfur particles into the atmosphere, all that is required is to replace standard crops such as wheat and barley with varieties that are more light reflective. At least that is what Andy Ridgewell from the University of Bristol claims. The Guardian reports that Ridgewell and a team of researchers used climate modeling to determine the effects of planting different crop varieties on global temperature. The scientists found that simply by planting the most reflective variety a cooling of 0.1C would be obtained. Projections of greater cooling in the future would be based on developing even more reflective varieties. Ridgewell points out that there would not have to be any change in the type of crops or amounts of crops, the only change would be that crops would reflect more light. It seems hard to believe that the solution to the global warming problem could be as simple as planting different varieties of wheat, barley, and corn. Perhaps it is too simple but at least if this scheme fails people will be well fed.

Wednesday, January 14, 2009

2008 Ties 2001 for 8th Place on Warmest Year List

Analysis of preliminary global temperature data by the US National Oceanic and Atmospheric Administration (NOAA) found that 2008 was the eighth warmest year since 1880, tying 2001 for the honor. According to NOAA, over the last three decades the global temperature has been increasing by 0.29 degree F (or 0.16 degree C) per decade. Using a different method of analysis but the same data NASA’s Goddard Institute for Space Studies found that 2008 was the ninth warmest year. In any event, the data show that compared to a few decades ago the planet is rapidly heating up and projections are that we “haven’t seen nothin’ yet.” In fact, Purdue University climate scientist Matthew Huber, who applies climate models to past climates says that these models may be underestimating future warming. The NZHerald, a New Zealand website, reports that Huber used one of the same models used by the UN’s Intergovernmental Panel on Climate Change (IPCC) but to make predictions of warming during a warming period 55 million years ago when there was a similar rapid increase of greenhouse gases in the atmosphere and found the temperatures predicted by the model were lower than what actually occurred. The NZHerald site reported that Huber thinks his finding shows that the model is probably predicting temperatures on the low side during the current period of global warming. Yet more evidence that the IPCC has been underestimating the global predicament that we have created.

Saturday, January 10, 2009

Iron-Dumping Ship Leaves Harbor for Ocean Geoengineering Experiment

Carrying 20 tons of ferrous sulfate, a ship has left South Africa to dump the iron into the Southern Ocean with the hope it will spur a plankton bloom in order to remove carbon dioxide from the atmosphere. According to a New Scientist article, this is not a commercial venture but a scientific expedition and it has the scientific backing of the German, Indian, and UK governments. With regard to concerns that this experiment could have undesirable consequences, Ken Caldeira from Stanford University says in the article that such a small amount of iron “is unlikely to have a lasting effect” but “The rational concern is that experiments will lead down some slippery slope - that small experiments could be scaled up without any regulation.” It may be prudent not to begin such experiments but it seems they are going ahead. We could screw up the ocean more than we already have. Perhaps we should heed the words of Dr. Glen Barry who writes in his Climate Change Blog that “Geoengineering is indicative of both humanity's ignorance and laziness when confronted with tremendous challenges of their own making such as climate change.” It appears unlikely that such sentiments will prevail.

Sunday, January 04, 2009

Reducing Soot Emissions Could Quickly Slow Global Warming

With all the attention on reducing carbon dioxide emissions as the primary means of fighting global warming relatively little attention has been paid to another major cause of warming, soot. The Independent reports that a published study by NASA’s Goddard Institute for Space Studies found that simply reducing the emissions of soot would quickly produce a cooling effect. Unlike carbon dioxide which can remain in the atmosphere for more than one hundred years soot rapidly falls back to earth to so the time between reducing emissions and cooling is short. According to the study the two most effective ways to reduce soot emissions would be by “reducing emissions from domestic fuel burning” in developing countries and “reduction in surface transport emissions in North America.” Since the technologies to reduce these emissions is readily available it would seem that the main question is whether governments will act. The wealthier countries would have to help the developing countries pay for technologies that eliminate soot emissions, e.g., solar stoves, and strict regulations would have to be imposed on the trucking industry in North America. Compared to what it will take to drastically reduce carbon dioxide emissions this seems like a relatively easy goal to achieve. If effective action is taken, not only might global warming be reduced but numerous lives would be saved from a reduction in toxic air pollutants.

Thursday, December 18, 2008

The Path to 350 ppm CO2

Scientists who have changed the atmospheric carbon dioxide level target from stabilizing CO2 at a level of 450 parts per million to a much lower level of 350 ppm have been tinkering around with the problem of how to accomplish this much more ambitious goal. One of these scientists is Pushker Kharecha from NASA’s Goddard Institute of Space Studies. Dr. Kharecha told BBC News that his group’s research showed that the only possible way was to promptly enact a moratorium on new coal use that does not capture CO2 and to phase out existing coal emissions by 2030. Also, he noted that reforestation and better agricultural practices could remove some CO2 from the atmosphere which would help. Dr. Kharecha also stressed the importance of energy efficiency and conservation in the short term as longer-term efforts are taken to provide alternative energy sources to fossil fuels.

Right now the world seems to be going in the direct opposite direction. Rather than a moratorium on coal plants that do not capture C02 the plans are in the works in a number of countries for hundreds of more typical coal plants. China itself is building one or two new plants each week. The promise of capturing and storing CO2 emissions from coal, which has been dubbed “clean coal” by the coal industry, so far has remained no more than a promise and seems likely never to be fulfilled.

The gap between what it will take to lower the CO2 level to a climate-stabilizing 350 ppm from the ice-melting present level of about 386 ppm and the reality on the ground appears unbridgeable. All the momentum is toward ever upward CO2 levels. Since the United States is responsible for more of the CO2 up there than any other country it seems logical that we should take the first step, that is, declare a moratorium on new coal plants that can’t capture CO2 emissions. Time to leave square one.

Saturday, December 13, 2008

Al Gore Supports 350 ppm Target for CO2 Levels

Addressing delegates yesterday in Poznan, Poland at a UN meeting on climate change, Al Gore told them that the present target of stabilizing atmospheric levels of carbon dioxide at 450 part per million (PPM) should be abandoned for a new target of 350 ppm. Present levels are about 386 ppm. Since many experts believe that even achieving the 450 target is beyond feasibility, achieving the 350 target might be thought of as just wishful thinking. However, if we don’t get back to 350 ice in the polar regions could just keep melting and melting with catastrophic consequences. According to The Independent, Gore said that to combat climate change the world needs to focus more on global warming and less on celebrities, naming three in particular, O.J. Simpson, Paris Hilton, and the late Anna Nicole Smith. That’s going to be difficult. Clearly advertisers are willing to pony up a lot more money to back shows featurings non-news about the three celebs Gore mentioned and many others than gloom and doom real news about global warming. It appears that the free press is a two-edged sword. You get to find out what governments are really up to, at least sometimes, but you also get endless drivel. It would seem that the climate change crisis is unfolding too slowly to have much chance of driving Brittany Spears out of the news. The Dr. J. TV ad for Dr. Pepper says that “slower is better.” Well maybe for sipping soft drinks, but not for getting the media to pay attention to serious problems. Based on where the world focuses its attention we will be lucky to hold the line at 600 ppm. And maybe even that is a stretch.

Tuesday, December 02, 2008

Environmentalists versus Environmentalists over Carbon Trading

Carbon cap and trade as a strategy to reduce greenhouse gas emissions has wide support ranging from many beltway politicians to the large mainstream environmental organizations, but a coalition of environmental groups called Rising Tide North America doesn’t buy this strategy, at least the carbon trading part. To bring attention to their viewpoint they invaded the Washington, DC offices of Environmental Defense (formerly the Environmental Defense Fund) to protest Environmental Defense’s support for carbon trading. The Boston Globe’s Green Blog reports that the protest included holding signs saying “carbon trading is an environmental offense,” and “keep the cap, ditch the trade.”

One of the protesters, Rachel Smolker, whose father was a founding member of the Environmental Defense Fund, has issued a statement which is posted on the Global Justice Ecology Project website. Her statement includes the following sentiments about carbon trading:

“We cannot pretend that handing out permits to pollute and then trading them around like baseball cards is even remotely related to seriously reducing emissions. It is a great get-rich-quick scheme for the brokers, marketers and financiers who enjoy playing games with my childrens, future, and it is a huge gift to the polluting criminals."

Smolker also blasted carbon offsets, another controversial strategy for reducing greenhouse gas emissions.

“Offsetting emissions is a similar deceit, nothing but another fine arrangement of smoke and mirrors that allow some people to "feel good" while continuing to carry on business as usual. They provide a convenient way to sidestep and avoid real and necessary change. It is, without question, a lovely idea to provide funding to really good "quality" projects that hold promise of reducing emissions, but there are more straightforward ways to get there that do not require unfounded and unreliable measures of carbon flow, additionality, verifiability or permanence, and do not confuse fossil and biological carbon. We clearly need to halt, not offset emissions, even where it is a hard thing, a very hard thing to do.”

Whether carbon trading as well as carbon offsets will be effective in reducing greenhouse gas emissions or are simply some sort of ploy as Smolker contends or just poor ideas remains to be seen. Both mechanisms are now being used in the Kyoto Protocol and the results so far do not seem encouraging. But there does not seem to be any clear strategy for “Confronting the Root Causes of Climate Change” as Rising Tide North America puts in their logo. A broad consensus on what to do seems always beyond reach.

Sunday, November 16, 2008

Increasing Salp Populations Seen as Possible Natural Negative Feedback Mechanism

There has been a lot of talk about sequestering and storing the carbon dioxide emitted from coal plants, sometimes referred to by the term “clean coal” (an oxymoron?), but so far there has been little action. Nature, on the other hand, may really be stepping it up when it comes to carbon dioxide sequestering. Evidence comes from a report that salps, which are small jelly-like creatures that live in the ocean and survive by consuming algae, have increased markedly in abundance near Sydney, Australia since a salp survey was performed 70 years ago. The Sydney Morning Herald reports that the results of a recent marine survey found that the salps have increased in number by a factor of 10. Previously there have been reports of increasing salp populations off Antarctica. After the salps consume algae, which take in carbon dioxide from the atmosphere, the carbon dioxide eventually winds up on the ocean floor either in the feces from the salps or in the salps themselves after they die. Salps can consume tremendous amounts of algae because they reproduce very rapidly, in fact, more rapidly than any other multicellular organism. Their reproduction is so rapid that salps can double their population within a few hours.

It’s obviously too soon to know if salps are playing a role in stabilizing the climate. With global emissions of carbon dioxide still increasing about 3-4% per year despite knowledge on the implications of what this means for the planet it seems hard to believe that salps will matter. However, if because of political reasons we can’t stop global warming maybe the salp, with perhaps the most rudimentary of all nervous systems, can.

Monday, November 10, 2008

Maldives Preparing to Flee Rising Seas

While countries such as the US and China are pouring out the greenhouse gas carbon dioxide like there is no tomorrow, the leader of the island nation of the Maldives has come to realize that maybe there actually is no tomorrow, at least for his country. With scientific predictions that sea level might rise by several feet by the end of this century which is about the elevation of the islands, with the highest point of the nearly 1,200 islands being only about 8 feet, the recently elected Mohamed Nasheed told The Guardian that “We do not want to leave the Maldives, but we also do want to be climate refugees living in tents for decades.” The plan is to buy land. Where? The most likely places according to Nasheed are Sri Lanka and India. Australia is another possibility. The money for land purchases would come from funds generated by tourism. If nothing else, this plan should get the issue of climate change more attention. Perhaps it will finally get the world leaders to take action on a scale that is meaningful. Like the melting Arctic icecap and the disappearing glaciers of Greenland this plan sends an alarm.

Thursday, September 25, 2008

Stop New Coal Plants with Civil Disobedience Says Al Gore

Speaking at the Clinton Global Initiative in New York City former vice president Al Gore, according to Reuters, had these words of advice for young people:
"If you're a young person looking at the future of this planet and looking at what is being done right now, and not done, I believe we have reached the stage where it is time for civil disobedience to prevent the construction of new coal plants that do not have carbon capture and sequestration."

It appears that Gore has given up on the political process producing a moratorium on all new coal plants that do not capture and sequester carbon, an unproven technology. Leading climate scientist James Hansen has said such a moratorium is necessary. If there is a problem with Gore’s call for action it is that the young people who would be carrying out the acts of civil disobedience by and large are probably also excessive consumers of electricity and thereby partly responsible for creating a market for the coal plants. Unless one’s carbon footprint with regard to electricity use is miniscule how do you put your body in front of a bulldozer to stop a coal plant without being hypocritical. Given all the devices in use that require electricity from the grid either directly or through rechargeable batteries such as computers, TVs, iPods, cell phones, radios, dishwashers, refrigerators, air conditioners, and so forth it is going to be hard finding enough young people who have really taken large steps toward energy efficiency and conservation. Unless politicians in office stop worrying about how to meet an increasing demand for electricity and start worrying about how to reduce the demand for electricity it is going to be tough going stopping coal plants from being built, whether by civil disobedience or any other strategy.

Wednesday, September 24, 2008

Arctic Methane Bubbles May Be Sign of Future Troubles

The sleeping giant of global warming, vast sub-sea deposits of the powerful greenhouse gas methane, may be waking up. Preliminary findings of a study along the northern coast of Russia, which were relayed to The Independent, suggest that methane bubbles formed from methane below the seabed are reaching the surface. Past scientific expeditions in this remote area have found increased levels of dissolved methane but not until this most recent expedition have the scientists seen methane bubbling to the surface, an indication that the amount of methane being released is now so great that it can not be all dissolved by the sea before surfacing. It is thought that the methane has been trapped under the permafrost for tens of thousands of years but with the recent increase of temperature in the Arctic due to a build up of greenhouse gases in the atmosphere openings in the permafrost are allowing the methane to escape.

Are the methane bubbles an indication that a great positive feedback mechanism has kicked in making it essentially impossible to halt global warming before a global catastrophe occurs? This certainly would seem to be a possibility given the predictions by scientists that such a chain of events could happen. We will have to wait for further evaluation of this finding and what its implications are but clearly there is more to worry about these days than an unraveling economic system.

Saturday, September 13, 2008

Amount of Greenhouse Gases in Permafrost Double Previous Estimates

One of the most feared positive feedback mechanisms that could propel global warming is the melting of permafrost containing large amounts of carbon dioxide and methane. It now appears that the vast amounts of greenhouse gases that are stored in permafrost are even greater than previous estimates, in fact, about twice as much. According to an article in theage.com scientists have published a report in the journal Bioscience in which they describe arriving at this new calculation by reanalyzing data from Russia and digging far deeper into the permafrost areas than has been done before. The results suggest that the potential for permafrost to melt, release greenhouses gases which further increase the global temperature and thereby melt more permafrost and so forth is even worse than has been thought. This recent finding seems to make it even more urgent to quickly get greenhouse gas emissions under control. Permafrost has been called a ticking time bomb. That about sums it up.

Friday, September 05, 2008

McCain’s Big Speech Omits Climate Change

First John McCain picks a vice presidential running mate that doesn’t believe that humans are causing global warming and then at his big speech at the Republican National Convention he doesn’t even mention global warming or climate change. I guess mentioning either of these two terms to his base supporters of religious fundamentalists and ideologues opposed to government regulation of corporations would have reminded them that only a few days ago they were not too crazy about John McCain. Having recently reversed course on offshore oil drilling will he now reverse himself on mandatory caps for carbon emissions? With regard to the environment it seems unclear what he stands for, if anything. With reductions in carbon emissions being needed to begin almost immediately to avoid a climate catastrophe down the road the US voters only have one more chance to get it right. McCain’s recent behavior is making the choice pretty much a no brainer.

Sunday, August 31, 2008

McCain VP Pick a Global Warming Denier

Since John McCain is one of the few Republican leaders who has defied President Bush by supporting a mandatory cap on carbon emissions to fight global warming his pick of Alaska Governor Sarah Palin for a running make is surprising, not only because she is a woman and has no experience in foreign policy but based on a statement to Newsmax Magazine she denies that global warming is being caused by human sources. When asked “What is your take on global warming and how is it affecting our country?” she replied, “A changing environment will affect Alaska more than any other state, because of our location. I'm not one though who would attribute it to being man-made.” Okay, then what would you attribute it to? To bad there was no follow-up question. And, so much for science. Even Bush is no longer that far out. Apparently McCain, who is 72 years old, not only hopes to survive his term in office if he wins but is sure that he will. Given his views on global warming he must know that if Palin ever became president it would be a disaster. How could she work with the Europeans who are frantic over the looming catastrophe that climate change poses? Who would be left to convince the Chinese, who now lead the world in greenhouse gas emissions, to reduce their emissions? As the Arctic ice cap melts away to water and Greenland begins to live up to its name it is clear that George Bush’s victory (if you can call it that) in the 2000 election has spelled disaster in the effort to fight climate change. Perhaps it is already too late to reverse course, but if we really have one last chance that reprieve seems certain to go down the tube if Sarah Palin were to become president.

Friday, August 22, 2008

McCain’s Seven-Home Carbon Footprint

Can someone who owns seven homes lead the world in taking on the global warming crisis? Thanks to an inquisitive reporter we now know that John McCain owns six more homes than the average American. Of course the big story was that when asked by a reporter how many homes he owns McCain amazingly didn’t know and referred the reporter to his staff. Certainly the carbon emissions associated with his seven homes are no doubt only a small fraction of McCain’s carbon footprint. All the flying around the country he has done while running for president probably has a larger carbon footprint than a small African nation. But overall, when it comes to greenhouse gas emissions flying only accounts for a small percentage of carbon emissions whereas operating buildings accounts for about half, at least in the US. Owning seven homes may not be fatal to the task of leading the world against global warming but it certainly doesn’t help.

Saturday, August 09, 2008

British Urged to Prepare for 4C Warming

The UKs chief scientific adviser, Professor Bob Watson, recently told The Guardian that it would be wise for the UK to begin active preparation for an increase in global temperature of 4C. It’s pretty much agreed that such an increase from preindustrial levels of temperature would be catastrophic. The goal of the UK is to hold the increase to 2C but Watson says that we can’t be certain how to do that so we should prepare for at least a 2C overshoot of the mark. Professor Neil Adger, from the Tyndall Centre for Climate Change Research, is quoted as saying that “I think that is a dangerous mindset to be in…There is no science on how we are going to adapt to a 4 degree warming.”

This all seems a little reminiscent of the 1950s in the United States when citizens were given instructions on how to survive a nuclear war with the Soviet Union. The government put out films showing how families could build underground shelters in their backyards to hide until it was safe to come out and school children were given duck-and-cover drills in which they hid under their desks protecting their ears and eyes from the nuclear explosion. Looking back it seems obvious that the only thing accomplished was mass self-delusion that the public could survive a nuclear war. This era of self-delusion was followed by the realistic strategy of mutual assured destruction which reduced the likelihood of a first strike since it was evident that neither country would survive.

It seems unlikely that a 4C increase in temperature would be as destructive as a nuclear war although scientists seem to think that a large percentage of all species would face extinction. Former UK chief adviser Sir David King is quoted in the article as saying that “My own feeling is that if we get to a 4 degree rise it is quite possible that we would begin to see a runaway increase.” That suggests the survival of civilization is at stake if not the survival of Homo sapiens.

With all these uncertainties is hard to know what to do. It seems the best course is to go all out to reduce carbon emissions and deforestation and hope for some good luck.