The climate alarmist crowd never tires of insisting that anthropogenic additions to atmospheric carbon dioxide---up by 45 percent, from 280 to about 407 parts per million, since before the Industrial Revolution---are driving historically unprecedented and likely-to-become catastrophic global warming, and that they're exacerbated by increases in atmospheric methane (CH4) driven by the rising temperature, making methane a positive feedback. The claim rests on the notion that carbon dioxide level … [Read more...]