My theory is that decades ago, when air planes were invented or shortly after, scientists and rich folks immediately started experimenting with weather modification by spraying chemicals in the air. They saw how major portions of land on earth is unusable because of cold climate and permafrost, that's potential being unused. They knew people would notice temperatures rising so they made up this climate change science to explain it. The data doesn't show that temperatures will rise but it's not looking at the chemicals they're spraying or considering that they can alter it and the amounts whenever they want so the past isn't predictive of the future. I think temperatures will rise, it won't be a doomsday or an apocalypse, it'll make some land more valuable.