The APS is soliciting comments by its members on a draft statement on climate change, following up
their 2007 statement.
The current draft has three sections: On Climate Change, On Climate Science, and On Climate Action. Eli has written earlier about the near-kidnapping of the process by a subcommittee stacked with several climate change deniers.
Here is the draft of my suggestions. The draft was reduced in length to match APS's 3500-character limitation.
Suggestions for APS statement on climate change
Change the last sentence of the first paragraph (
On Climate Change) to read….
The potential consequences of climate change are great: rising temperatures, melting polar ice caps, rising sea levels, ocean acidification, and more intense extremes of the hydrological cycle (drought and floods). Some of these consequences of anthropogenic global warming (including melting of the polar ice caps) are happening now, and will become more severe in the future. The policies of the next few decades will determine human influences on the climate for centuries.
On Climate Science
The basic ideas underlying the Greenhouse Effect have been recognized for nearly two centuries. The atmosphere is largely transparent in the visible part of the spectrum, and largely opaque in the infrared part of the spectrum. This fact, combined with the Stefan-Boltzmann law, explains why the Earth is warmer than it would be in the absence of greenhouse gases in the atmosphere. A simple calculation shows that in the absence of greenhouse gases, the earth’s surface temperature would be -18 C, colder than the freezing point of water. Instead, the Earth’s surface is +15 C, which is 33 C warmer. This naturally occurring Greenhouse Effect is a large effect, which has existed ever since the early Earth acquired a greenhouse atmosphere billions of years ago.
Since the industrial revolution two centuries ago, the burning of fossil fuels has increased the concentration of carbon dioxide in the atmosphere. This leads to an anthropogenic enhancement of the greenhouse effect and further warming. The argument is a short and simple one: burning of fossil fuels —> increased atmospheric concentration of carbon dioxide —> enhanced greenhouse effect
—> modern anthropogenic global warming.
Modern climate scientists argue about the details, but not about the basic finding; i.e., whether or not anthropogenic global warming is happening at all. A useful analogy is with evolution in biology: Nearly all biologists believe in evolution. Biologists argue about the details of evolution, but not about whether or not evolution is happening at all.
A crucial question is whether or not modern anthropogenic global warming will cause a temperature rise that is large enough to cause a problem. The research, summarized by the IPCC, has asked what temperature rise would result from a doubling of carbon dioxide levels in the atmosphere compared with preindustrial levels. Estimates center on a temperature rise of 3 C. While this result is calculated by computer modeling, it agrees with estimates using the sensitivity of the earth’s climate, as measured using the empirical data from the Earth’s warming at the end of the ice ages. This enhances confidence in the computer models.
A temperature rise of 3 C will be enough to melt the polar icecaps. Indeed
the polar icecaps are starting to melt already.
On Climate Action
Atmospheric carbon dioxide levels are currently 400 ppm, 43% higher than the preindustrial level of 280 ppm. A level of twice the preindustrial level (560 ppm) will be reached within a few decades if current trends continue. The situation is urgent because increased carbon dioxide concentrations persist in the atmosphere for centuries.
After the current final sentence:
The APS further urges physicists to collaborate with colleagues across disciplines in climate research and to contribute to the public dialogue.
Add the following…
The APS is not acting in isolation, as shown by the 36 science academies from countries or regions around the world that have issued statements accepting global warming.
These include: Australia, Belgium, Brazil, Cameroon, Canada, the Caribbean region, China, France, Germany, Ghana, India, Indonesia, Ireland, Italy, Japan, Kenya, Madagascar, Malaysia, Mexico, Nigeria, New Zealand, Russia, Senegal, South Africa, Sudan, Sweden, Switzerland, Tanzania, Uganda, United Kingdom, United States, Zambia and Zimbabwe.
National and international organizations from nearly every field of science have issued statements accepting global warming. No scientific organization (which excludes denier websites and front groups) has issued a statement rejecting the basic findings of human-caused global warming.
The list of over 60 organizations includes: American Academy of Pediatrics, American Association for the Advancement of Science, American Association of Petroleum Geologists, American Association of State Climatologists, American Association of Wildlife Veterinarians, American Astronomical Society, American Chemical Society, American College of Preventative Medicine, American Geological Institute, American Geophysical Union, American Institute of Physics, American Institute of Biological Scientists, American Institute of Professional Geologists, American Medical Association, American Meteorological Society, American Physical Society, American Public Health Association, American Quaternary Association, American Society for Microbiology, American Statistical Association, Arctic Climate Impact Association, Australian Coral Reef Society, Australian Institute of Physics, Australian Medical Association, Australian Meteorologic and Oceanographic Society, Canadian Federation of Earth Sciences, Canadian Foundation for Climate and Atmospheric Sciences, Canadian Meteorological and Oceanographic Society, Engineers Australia, European Academy of Sciences and Arts, European Federation of Geologists, European Geosciences Union, European Physical Society, European Science Foundation, Federation of Australian Scientific and Technological Societies, Geological Society of America, Geological Society of Australia, Geological Society of London, Institute of Biology (UK), Institute of Professional Engineers (NZ), InterAcademy Council, Intergovernmental Panel on Climate Change, International Association for Great Lakes Research, International Council of Academies of Engineering and Technological Sciences, International Council on Science, International Union for Quaternary Research, International Union of Geodesy and Geophysics, NASA’s Goddard Institute of Space Studies, National Association of Geoscience Teachers, National Center for Atmospheric Research, National Oceanic and Atmospheric Administration National Research Council, Network of African Science Academies, Pew Center on Climate Change, Polish Academy of Sciences, Royal Meteorological Society (UK), Royal Society of New Zealand, Society of American Foresters, State of the Canadian Cryosphere, The Wildlife Society (International), Union of Concerned Scientists, US Geological Survey, Woods Hole Oceanographic Institute, Woods Hole Research Center, World Federation of Public Health Associations, World Health Organization, World Meteorological Organization, World Wildlife Fund.
Reference for the science academies and professional organizations:
James Lawrence Powell, The Inquisition of Climate Science, Columbia University Press, New York, 2011, reviewed
by me in 2012.