"Climate change" is "fossil fuel"-friendly alternative to avoid saying "Global warming" for what is happening. It is disingenuous to suggests that "Global warming" is unrelated to the article.
The article equates the certainty with which we know results in Psychology and Climate change (the terms are separated by commas as you've noticed). Psychology has a very flimsy foundation: even major results can be debunked (e.g., ego depletion). On the other hand there is no doubt that the climate change (global warming) is happening.
The article can be used as a tool by climate change deniers. They could say: "science have many major issues and therefore climate change is a figment of these communist eggheads imagination."