Why the End Times Might Reek of Methane

What does a climate change "tipping point" look like? We may be about to find out first hand.

Carbon dioxide isn't the only greenhouse gas out there. Other substances, such as water vapor and nitrous oxide, also trap heat to varying degrees. Discussions about global warming focus on CO2 for a couple of key reasons: the first is that human activities have demonstrably increased carbon dioxide; the second is that the other gases tend to cycle out of the atmosphere pretty quickly. For the most...