Bill McKibben: This is how the earth works now

[Junkdrawer]

42. Here's three sources, starting with the IPCC...

FAQ 10.3, Figure 1. (a) Simulated changes in atmospheric CO2 concentration relative to the present-day for emissions stabilized at the current level (black), or at 10% (red), 30% (green), 50% (dark blue) and 100% (light blue) lower than the current level; (b) as in (a) for a trace gas with a lifetime of 120 years, driven by natural and anthropogenic fluxes; and (c) as in (a) for a trace gas with a lifetime of 12 years, driven by only anthropogenic fluxes.

https://www.ipcc.unibe.ch/publications/wg1-ar4/faq/wg1_faq-10.3.html

Stabilizing Climate requires Near-Zero Emissions

Reposted from ScienceDaily (Feb. 18, 2008) Now that scientists have reached a consensus that carbon dioxide emissions from human activities are the major cause of global warming, the next question is: How can we stop it? Can we just cut back on carbon, or do we need to go cold turkey? According to a new study by scientists at the Carnegie Institution, halfway measures won’t do the job. To stabilize our planet’s climate, we need to find ways to kick the carbon habit altogether.

In the study, to be published in Geophysical Research Letters, climate scientists Ken Caldeira and Damon Matthews used an Earth system model at the Carnegie Institution’s Department of Global Ecology to simulate the response of the Earth’s climate to different levels of carbon dioxide emission over the next 500 years. The model, a sophisticated computer program developed at the University of Victoria, Canada, takes into account the flow of heat between the atmosphere and oceans, as well as other factors such as the uptake of carbon dioxide by land vegetation, in its calculations.

This is the first peer-reviewed study to investigate what level of carbon dioxide emission would be needed to prevent further warming of our planet.

...

With emissions set to zero in the simulations, the level of carbon dioxide in the atmosphere slowly fell as carbon “sinks” such as the oceans and land vegetation absorbed the gas. Surprisingly, however, the model predicted that global temperatures would remain high for at least 500 years after carbon dioxide emissions ceased.

Just as an iron skillet will stay hot and keep cooking after the stove burner’s turned off, heat held in the oceans will keep the climate warm even as the heating effect of greenhouse gases diminishes. Adding more greenhouse gases, even at a rate lower than today, would worsen the situation and the effects would persist for centuries.

...

http://co2now.org/Future-CO2/Targets/stabilizing-climate-requires-near-zero-emissions.html

NOAA stunner: Climate change “largely irreversible for 1000 years,” with permanent Dust Bowls in Southwest and around the globe


Important new research led by NOAA scientists, “Irreversible climate change because of carbon dioxide emissions,” finds:

…the climate change that is taking place because of increases in carbon dioxide concentration is largely irreversible for 1,000 years after emissions stop…. Among illustrative irreversible impacts that should be expected if atmospheric carbon dioxide concentrations increase from current levels near 385 parts per million by volume (ppmv) to a peak of 450-600 ppmv over the coming century are irreversible dry-season rainfall reductions in several regions comparable to those of the ”dust bowl” era and inexorable sea level rise.

I guess this is what President Obama meant when he warned today of “irreversible catastrophe” from climate change. The NOAA press release is here. An excellent video interview of the lead author is here.

The Proceedings of the National Academies of Science paper gives the lie to the notion that it is a moral choice not to do everything humanly possible to prevent this tragedy, a lie to the notion that we can “adapt” to climate change, unless by “adapt” you mean “force the next 50 generations to endure endless misery because we were too damn greedy to give up 0.1% of our GDP each year” (see, for instance, McKinsey: Stabilizing at 450 ppm has a net cost near zero or the 2007 IPCC report).

The most important finding concerns the irreversible precipitation changes we will be forcing on the next 50 generations in the U.S. Southwest, Southeast Asia, Eastern South America, Western Australia, Southern Europe, Southern Africa, and northern Africa (see also US Geological Survey stunner: SW faces “permanent drying” by 2050 and links below)

http://thinkprogress.org/climate/2009/01/26/203610/noaa-climate-change-irreversible-1000-years-drought-dust-bowls/

I could go on and on and on....