As far as I can tell, none of the sources in that article are scientific journals. There's one letter from a university, which doesn't even make a specific claim. Otherwise, it's a bunch of newspaper articles. There are certainly people who catastrophize climate change, but unless the predictions are appearing in scientific journals they don't matter. I'm sure you can find people making pretty ridiculous claims about almost anything if you looks hard enough. The important question is 'what are the experts saying?'

