Scientific American: What goes up and doesn't come down? Greenhouse gas emissions, apparently. The world set another record in 2012, spewing some 31.6 billion metric tons of carbon dioxide, methane, hydrofluorocarbons 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 saw another inconclusive round conclude this past week. We are on track for three degrees C of...