Hansen writes to Japan PM, speaks at UN University G8 event on 4 July 2008July 4, 2008 at 1:07 am | Posted in 350 ppm, Climate change, Climate science, Environment, Global warming, James Hansen | Leave a comment
Tags: 350 ppm, Basic facts, Climate challenge, Climate change, Climate science, CO2 emissions, CO2 targets, Environment, Fossil fuels, G8, Global warming, James Hansen, Tipping points
My address tomorrow1 to the United Nations University G8 Symposium summarizes scientific data revealing that the safe level of atmospheric carbon dioxide (CO2) is no more than 350 ppm (parts per million), and is likely less than that. Implications for energy policy are profound, as atmospheric CO2 is already 385 ppm. A course that minimizes climate change is still feasible2, 3. But basic fossil fuel facts must be acknowledged to define that course.
Writes Dr. James Hansen, in his letter to Prime Minister Fukuda before the G8 meeting.
1 Climate Threat to the Planet: Implications for Energy Policy, J Hansen, available at http://www.columbia.edu/~jeh1
2 Target atmospheric CO2: where should humanity aim? J Hansen, M Sato, P Kharecha, D Beerling, R Berner, V Masson-Delmotte, M Raymo, D Royer, J Zachos, http://arxiv.org/abs/0804.1126 and http://arxiv.org/abs/0804.1135
3 Global Warming Twenty Years Later: Tipping Points Near, J Hansen, http://www.columbia.edu/~jeh1/2008/TwentyYearsLater_20080623.pdf