I’ve seen other people take the Medieval Warm Period out of context as a kind of gotcha. Also some Brits think that Global Warming sounds lovely.
I don’t fully understand climate change by any means, but I’ve read enough to be really impressed by how throughly scientists have researched and pieced together the underlying pattern.
Amongst other things, they’ve studied:
Ocean Conveyor Belts (including the Gulf Stream)
Ice-albedo feedback
Ancient air bubbles trapped in glaciers in Greenland
Ancient coral reefs, including one which formed about 120 million years ago
A possible relationship between the Sahara Desert and the Amazon Rainforest. We do know that thousands of years ago, the Sahara Desert was lush and green and the Amazon was much drier and prone to fires.
The effect of forest disturbances on the Siberian carbon sink
The effects of contrails produced by aircraft (I was interested to learn that night flights and winter flights are more damaging to the environment).