BFD. You can find videos on line which make very convincing arguments that the Earth is flat, or the Moon is actually a huge alien space station, or we are all going to die because the West Yellowstone calderra is going to erupt any day now.
What I know for sure, without the help of any online videos, is that things have changed significantly since I was a kid. The data shows that things are warming up and my personal observation is that our winters are increasingly shorter and milder. Even more telling is that animals, insects and plants that have traditionally thrived further south are constantly expanding their range northward and that's definitely not due to things being colder.