Scott Sklar
July 17, 2007
|
16 Comments
I thought I'd ask you for help in an online debate with some sharp folks who don't believe we are warming the earth. What's the most convincing science you know of on this? --Bob W, Pepe'ekeo, Hawaii
Bob, In an earlier Q&A, I advised that many of us "older" clean energy advocates had been promoting energy efficiency and renewable energy, recycling and resource conservation, and maximum reduction of fossil fuels for security and pollution (including mercury and carcinogen emissions) long before climate change was even acknowledged by those within the scientific community.
That said, my suggested reading list is the National Academy of Science review on climate change that covers Human Caused Climate Forcings, which addresses these questions:
• Are concentrations of greenhouse gases and other emissions that contribute to climate change increasing at an accelerating rate, and are different greenhouse gases and other emissions increasing at different rates?
• Is human activity the cause of increased concentrations of greenhouse gases and other emissions that contribute to climate change?
• What other emissions are contributing factors to climate change (e.g., aerosols, CO, black carbon soot), and what is their relative contribution to climate change?
• How long does it take to reduce the buildup of greenhouse gases and other emissions that contribute to climate change?
• Do different greenhouse gases and other emissions have different draw-down periods?
• Are greenhouse gases causing climate change?
This is the most balanced review I have read. And the National Academy of Science states: "Carbon dioxide (CO2) is probably the most important climate forcing agent today, causing an increased forcing of about 1.4 W/m2. CO2 climate forcing is likely to become more dominant in the future as fossil fuel use continues. If fossil fuels continue to be used at the current rate, the added CO2 forcing in 50 years will be about 1 W/m2. If fossil fuel use increases by 1-1.5% per year for 50 years, the added CO2 forcing instead will be about 2 W/m2. These estimates account for the non-linearity caused by partial saturation in some greenhouse gas infrared absorption bands, yet they are only approximate because of uncertainty about how efficiently the ocean and terrestrial biosphere will sequester atmospheric CO2. The estimates also presume that during the next 50 years humans will not, on a large scale, capture and sequester the CO2 released during fossil-fuel burning."
The Academy also states, "Although warming at Earth's surface has been quite pronounced during the past few decades, satellite measurements beginning in 1979 indicate relatively little warming of air temperature in the troposphere. The committee concurs with the findings of a recent National Research Council report, which concluded that the observed difference between surface and tropospheric temperature trends during the past 20 years is probably real."
Former USDOE and Rocky Mountain Institute Scientist Joseph Romm just wrote his bellwether book "Hell and High Water: Global Warming - the Solution and the Politics - and What We Should Do." Combined with former VP Al Gore's film "Earth In the Balance," these articulate the more strident views, and both works draw upon a myriad of scientific studies.
My final climate reading suggestion is the paper by Hansen and other climate authorities for the National Academy of Sciences: Hansen, J., M. Sato, R. Ruedy, A. Lacis, and V. Oinas, Global warming in the twenty-first century: an alternative scenario, Proceedings of the National Academy of Sciences, 97: 9875-9880, 2000.
As I started this response, I addressed that accelerated and enhanced use of efficiency and renewables is the ultimate "no regrets" answer addressing changes in climate. Two papers written by former Union of Concerned Scientist Dr. Don Aiken and a companion article with Dr. Bull and Dr. Billman, both of the National Renewable Energy Laboratory, are worth reading:
• The Renewable Energy Transition: Can It Really Happen? by Donald W. Aitken, Solar Today, January-February 2005
• The climate stabilization challenge: Can renewable energy sources meet the target? by Donald W. Aitken, Lynn L. Billman and Stanley R. Bull, Renewable Energy World, November-December 2004
I have been in many dialogues with global policymakers, scientists, military leaders, and government officials concerning climate change and responses. My advice is that the scientific community does agree that greenhouse gas (of which carbon is of the largest proportion) is changing our climate.
We also know that while this has happened before, it has not happened while we humans were on earth. And while we do not know every aspect of this change, it would probably be judicious not to allow this grand climate experiment to continue unabated, but rather address it in ways that increase economic growth, protect global security, and decarbonize our economy -- all at the same time.
Good luck with your online debates.
--Scott Sklar
TO: GERRY WOLFF
For the sake of promoting sustainability in our culture without sending the wrong message, please revise your reasoning. The Earth isn't going to "burn down." what you're doing here is illustrating an apocalyptic message about someone other than the real victims - that is, humans, you and me. The planet is going to keep on rotating round and round.
Enough with the "Save the Planet" slogan. Most people don't care about the "planet" - they care about themselves, first and foremost.
www.climateaudit.org is a good site if you are math minded and don't mind going through a pile of statistics.
I have supported rmi.org (Rocky Mountain Institute) for more than 2 decades and continue to do so despite my view that the Kyoto protocol is a piece of bird cage lining.
Eat less beef! Seriously. Try some of the meat analogues and you will cut emissions more than any other way. http://www.physorg.com/news103983167.html
A kilogram (2.2 pounds) of beef causes more greenhouse-gas and other pollution than driving for three hours while leaving all the lights on back home
I like the article because we should always focus on resource efficiancy NOT just the latest in a long series of fear mongering. Sadly missing (as always it seems) is any mention of water vapor as the most important GHG.
"RealClimate does a great job of putting those "yes but" objections in context and answering them each in turn.".
I disagree and suggest you check out climateaudit.org
When confronted with the fact the CO2 trails warming in the ice cores the answer from realclimate.org was a bit of a joke! "There are 6 stages to a warming cycle and CO2 isn't responsible for the first one sixth but it is for the next 5 sixths". That is completely unsupported by any evidence.
I would like to know if there is a rating system for renewable products? I seems like everyone has the best products on the market. How can anyone find out which is the best of the best?
Thank you
Bernie
Why is it that the human herding culture requires danger or fear to do, at times, the right thing. Regardless of whether the "globe is warming" or the "climate is changing" we need to conserve all of our resources and use renewable options where we can. Not becuase of fear or becuase someone needs to make money off of our fears Many times doing something for the wrong reasons has unexpected and at times unpleasant surprises associated with it.
For those that weren't aware of the discussion around cliate change, here are links to two on-line documentaries on the subject:
http://www.aconvenientfiction.com/
http://video.google.com/videoplay?docid=-4520665474899458831&q=the+great+swindle
There are many good websites with current news and discussion about the reality of human influence on the climate. A great starting point is http://www.realclimate.org where a dozen active climatologists answer questions from readers and keep up on science news. They have a good list of links to more science-based information.
There is an active campaign to cloud the issue about this critical topic, suggesting the science is not settled, nit-picking at each point in the chain of reasoning and cherry-picking the very few journal articles that raise any sort of qualification or uncertainty. RealClimate does a great job of putting those "yes but" objections in context and answering them each in turn. It's pretty clear that the truth on this is indeed inconvenient, when you see the lengths some people will go to in trying to avoid it.
At a certain point, you have to accept that some people wouldn't admit that they smelled smoke, if their clothes were on fire. Trying to talk sense to them is like trying to persuade Osama bin Laden to change his mind. They are too pig headed to consider it, so forget them and focus on the people who are expressing an honest scepticism.
Of course, there is no possible way to say beyond any shadow of doubt that humans are causing climate change, but the idea that injected billions of net tons of carbon that has been burried over hundreds of millions of years back into the atmosphere in a few centuries is having no effect at all seems a bit far fetched.
However, the more important question is what is the worst thing that can happen, if we opt for cleaner alternatives and greater efficiency and it the science is later disproven, we may find (but will not necessarily find) that we have incurred some unecessarilly high capital costs, but going forward we will enjoy cleaner air, less dependence on foreign sources of energy, probably a lower variable cost per unit of energy. We may find that the moves have cost us some jobs in certain sectors (but they may also have created more / more stable jobs than they have cost).
The worst that can happen in the lives of our children and grandchildren if we do nothing to reduce CO2 emissions and the vast majority of climate scientists turn out to be right is a climate disaster the likes of which humans have not seen since the last ice age.
Imagine weighing up these two outcomes, one in each hand, and the smart risk management choices are pretty obvious.
RE-EDITED VERSION - At a certain point, you have to accept that some people wouldn't admit that they smelled smoke, if their clothes were on fire. Trying to talk sense to them is like trying to persuade Osama bin Laden to change his mind. They are too pig headed to consider it, so forget them and focus on the people who are expressing an honest scepticism.
Of course, there is no possible way to say beyond any shadow of doubt that humans are causing climate change, but the evidence is strong and the idea that we can take billions of tons of carbon that has been burried over hundreds of millions of years and inject it back into the atmosphere in a few centuries with no effect at all seems a bit far fetched.
However, the more important question is what is the worst thing that can happen, if we do / do not opt for cleaner alternatives and greater efficiency and the science is later proven / disproven beyond doubt? We may (but will not necessarily) find that we have incurred some unecessarilly high capital costs, but going forward we will enjoy cleaner air, less dependence on foreign sources of energy, probably a lower variable cost per unit of energy. We may find that the moves have cost some jobs in certain sectors (but they may also have created more / more stable jobs than they have cost).
On the other hand, the worst that can happen in the lives of our children and grandchildren if we do nothing to reduce CO2 emissions and the vast majority of climate scientists turn out to be right is a climate disaster the likes of which humans have not seen since the last ice age.
Imagine weighing up these two outcomes, one in each hand, and the smart risk management choices are pretty obvious.
Oceans are losing their ability to absorb CO2 as they become more saturated:
http://www.ens-newswire.com/ens/may2007/2007-05-18-04.asp
Isotopic evidence of fossil fuel source of CO2. Fossil fuels are depleted in the carbon fourteen isotope. In burning it, the amount of C-14 in the atmosphere should decrease at a rate that is faster than its half-life of 5730 years.
http://cdiac.ornl.gov/trends/co2/cent-scha.htm
Temperate zones have moved north in the U.S.:
http://www.washingtonpost.com/wp-dyn/content/article/2006/12/19/AR2006121901769.html
I like the "what do we have to lose?" attitude of most of the respondents above. I have worked with alternative means of producing energy over the past 18 years. I remember when Acid Rain was the boogeyman, then Ozone and now GHG. Through this all the "big polluters" have increased profits, changed names, turned over thousands of jobs and in the end the demand for energy has not dropped 1%.
As with most areas of the environment and the economy, as we continue to debate, someone is making money.Think back 100 years when we decided to industrilize, it has been a horserace ever since.
To add your comments you must sign-in or create a free account.
July 26, 2007
ENERGY AND KNOWLEDGE: 'Civilization as it is at present, even on the purely physical side, is not a continuous self-supporting movement. It becomes possible only after an age-long accumulation of energy, by the supplementing of income out of capital. Its appetite increases by what it feeds on. It reaps what it has not sown and exhausts, so far, without replenishing. Its raw material is energy and its product is knowledge. The only knowledge which will justify its existence and postpone the day of reckoning is the knowledge that will replenish rather than diminish its limited resources.' Frederick Soddy (Noble Laureate) on Matter and Energy in the year 1912.
It is high time to pay heed to this great man and adopt renewable energy ASAP in order to save our planet.
Yash Pal Singh