Evidence of global warming:
NASA says sea level is the yardstick of global warming. The rising sea level shows that our planet is warming.
Evidence of human causation
Here are two independent lines of research suggesting that humans are causing climate change:
- As carbon dioxide in the air increases, oxygen decreases.
- The light carbon in atmospheric carbon dioxide is increasing.
This evidence fits together
Notice how this evidence fits together. For example, it makes sense that both “global temperatures are increasing” and “Arctic ice is decreasing”. Both of these findings are consistent with global warming. It is the convergence of evidence like this that leads to scientific confidence.
Updated 21 April 2019