What goes up and doesn't come down? . The world set another record in 2012, spewing some 31.6 billion metric tons of carbon dioxide, ,and other greenhouse gases into the air. The 2012 contribution keeps us on pace for not one more degree Celsius of warming, or even two, as is the avowed goal of the international climate negotiations that sawconclude this past week. We are on track for 3 degrees C of warming or more, this century. That calculation comes from the , a kind of cartel for oil-consuming rich nations. But don't despair. The U.S. in recent years has reduced its greenhouse gas emissions back to levels last seen in the 1990s. That's thanks mostly to burning less coal. And there are some quick and easy steps that could reduce emissions globally: , , an end toand a ban on inefficient . If we did all of those, we might get on a new track that leads to a . David Biello [The above text is a transcript of this podcast.] Followon Twitterand . Visitfor the latest in science, health and technology news. 2013 . All rights reserved.
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