If the myths hold truths, the oil companies knew this was an issue in the '70s. By the late 80s the predictions had reached artists and musicians in the UK (how I know this is too convoluted and flakey for this thread). I was taught about climate change (the "greenhouse effect") as a young teen, early 90s. It's been canon for me since then. I have no problem believing that forward looking adults were talking about it, making art and activism in 1980.