Sunday, November 9, 2008

Stabilize at 350 ppm or risk ice-free planet, warn NASA, Yale, Sheffield, Versailles, Boston et al

The good news: We can avoid multimeter sea level rise, the loss of the inland glaciers that provide water to a billion people, rapid expansion of the subtropical deserts, and mass extinctions — each of which is all-but inevitable on our current path of unrestrained greenhouse gas emissions.

The not-so-good news: We will probably need an ultimate target of 350 ppm (or lower) for atmospheric carbon dioxide — if you accept the analysis of ten leading climate scientists from around the world.

And yes, the authors of “Target Atmospheric CO2: Where Should Humanity Aim?” in The Open Atmospheric Science Journal are painfully aware we’re already at 385 ppm and rising 2 ppm a year. That is why they propose the self-described “Herculean” task of phasing out coal use that does not capture CO2 over the next 20-25.” More >>>