The Chicken or the Egg: CO₂ and Temperature
The other day, I had a rather civil discussion with a climate change denier. His main argument was that, since the carbon dioxide (CO₂) concentration has historically followed the Earth’s temperature trend, it could not possibly be that man-made CO₂ emissions now dictate our natural climate.
After all, he went on, if CO₂ were responsible for a runaway climate effect, then we would have…