We keep hearing about the need to keep global climate change below a target of two degrees Celsius. However, few people know where this comes from. The reason for this is that the target is one of the most deliberately muddied topics in the climate change debate -- not a scientific number, but a political one.
What's outlandish is attributing massive changes in climate to increases in carbon dioxide, a trace gas that represents so miniscule a fraction of our atmosphere that it must be measured in parts per million. Established science had historically held natural forces to drive climate.