On Earth: Well, that was easy. I mean, not that easythere apparently was some late-night posturing and maybe even some shoutingbut negotiators from 195 nations in Paris actually managed to hammer out a climate change deal. The agreement will incorporate the carbon reduction goals that each country proposed prior to the meeting, with a goal of keeping the global average mean temperature rise below 1.5 degrees Celsius over the long term. The negotiators may have overshot their self-imposed deadline, but if...