February 5, 2009
What Levels of Warming Might Be Safe?
Here's Worldwatch Institute's cut at the necessary emissions reduction. Remember Hansen says we need to go carbon negative and reduce GHG levels to 350 ppm.
Despite nearly 20 years of international attention, greenhouse gas emissions continue to rise rapidly. The atmospheric concentration of carbon dioxide, in particular, has increased faster during the last 10 years than at any time since continuous measurements began in 1960. These emissions trends, if continued, can be expected to raise Earth's temperature by 4 to 6 degrees Celsius by the end of this century.
Research suggests that reducing emissions by 80 percent by 2050 will not eliminate all serious risks and damages. So what do we need to do to get to a "safe landing" for the climate? Read Bill Hare's chapter, "A Safe Landing for the Climate," in State of the World 2009: Into a Warming World to find out.
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