Anthropogenic Climate Change

We know what climate change is primarily caused by man-made CO₂ emissions. How do we know?

Let’s say for political or religious reasons you refuse to accept that the CO₂ is coming from man-made sources. Even if it is coming from some other source, it is still heating the world up alarmingly. It will not fix itself. We humans have to do something to bring the levels down, e.g.

~ Roedy (1948-02-04 age:70)