CO2 in our atmosphere is still increasing. In fact this year the annual average amount has passed 400 ppmv (part per million by volume) for the first time in a long time — at least a million years. The reason: we’re burning fossil fuels like oil, coal, natural gas. When we do, it turns that long-buried carbon into carbon dioxide, which ends up in the atmosphere. It’s as simple as that.
Support Your Global Climate Blog
Buy the book