Recent research since the 2007 IPCC report shows that many aspects of the climate are changing faster than previously projected, including rising sea levels, melting Arctic sea ice and glaciers, and warming oceans. Unless greenhouse gas emissions are rapidly reduced, thresholds may be crossed leading to accelerated and irreversible climate change impacts.

1. Climate Change Science since 2007 Update since release of Fourth Assessment Report (FAR) of Intergovernmental Panel on Climate Change (IPCC) in 2007 Paul H. Beckwith Sierra Club Canada November 26, 2009

19. Sea Level Rise: IPPC 2007 0.26 – 0.59 A1FI scenario 0.23 – 0.51 A2 scenario 0.21 – 0.48 A1B scenario 0.20 – 0.43 B2 scenario 0.20 – 0.45 A1T scenario 0.18 – 0.38 B1 scenario Model-based range excluding future rapid dynamical changes in ice flow Case Sea Level Rise - meters (by 2090-2099 relative to1980-1999)

35. 5.43 383.07 – 388.50 1.86 385.57 2008 5.72 380.81 – 386.53 1.86 383.71 2007 6.13 378.81 – 384.94 2.05 381.85 2006 5.73 376.72 – 382.45 2.24 379.76 2005 6.52 374.10 – 380.62 1.74 377.52 2004 Yearly change (ppm) Yearly range (ppm) Change in concentration from previous year (ppm) Yearly average carbon dioxide concentration (ppm) Year