The difference between "There used to be hot summers too,” and a climate crisis.
Look, we all know this is true. But there isn't a SOURCE for this, and the graph itself is basically illegible beyond "ooh colors". If we want to be good stewards of our informational resources, we need to cite our sources.
From a reverse image search, I found the website Show Your Stripes, run by the University of Reading in the UK, which is likely where the above graph originated. It provides temperature data for various regions of the world from approximately 1900-2025. For example, here are graphs for Canada, India, and Papua New Guinea:
All clearly show a sharp rise in temperature beginning around approximately the 1980s, which corresponds with the graph in OP's post. But now we know where this data came from, and we can verify its validity accordingly.
