Managing the Planet Woodrow Wilson International Center January 19, 2011 Thomas E. Lovejoy University Professor, George Mason University Biodiversity Chair, The Heinz Center SCIENCE, ECONOMICS AND THE ENVIRONMENT THE H. lavatory HEINZ III CENTER FOR Dr. Svante August Arrhenius 1859-1927 Analysis of a Greenland glassful core oxygen isotope proxy Source: Wallace Broecker CO2 for the Last 600,000 long time four hundred 360 320 280 240 200 160 Currently 385 ppm 2007 CO2-concentration (ppm) 1750 600�00 500�00 400�00 300�00 Years before present 200�00 100�00 0 Siegenthaler U et al. (2005) Science 310:1313 Petit JR et al. (1999) record 399:429 © Ch Körner Kö Ediths Checkerspot Range shift magnetic north and upward during the 20th century Most extinctions in southbound and low elevations © WWF-Cannon / Jurgen Freund Why is a CO2 target of 450ppm similarly high ? (1) Arctic sea-ice (2) Greenland ice-sheet stability (3) Antarctic ice-sheet stability (4) major(ip) ecosystem disruption What is a safe level?
James Hansen, et al., 2008 350 ppm The Role of aliveness Processes Origin of land plants Expansion of angiosperms Present-day CO2 Over the chivalric three centuries, ecosystems have lost 200-250 billion tons of carbon bunch of Anthropogenic CO2 Emissions (2000-2007) 1.5 Pg C y-1 Atmosphere 46% 2.6 Pg y-1 4.2 Pg y-1 7.5 Pg C y-1 + Land 29% Oceans 26% Canadell et al. 2007, PNAS (updated) 2.3 Pg y-1 Re?Greening the Emerald Planet If you wish to get a full essay, order it on our website:
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