The topic of climate change is an exemplary case of an interdisciplinary topic.
There is not one single scientific discipline of science working on it, but a wide spectrum.
It primarily includes meteorologists, physicists, sociologists, psychologists, statisticians and researchers of media studies.
Stack Exchange sites exist for individual sciences, but also for topics like bicycles and cooking. While usually not regarded as a science, these topics could be seen as scientific in an interdisciplinary way. So I think it is as a topic suitable for Stack Exchange.
Should a Stack Exchange site about climate change exist at all, and are there members of this site interested in it?
(You may want to have a look at a proposal for such a site: Climate Change.)