What we have now is nothing compared to what would happen. We expect large scale displacement and resource wars, but over the course of decades which gives people to adjust.

What you're describing would, by contrast, would kill hundreds of millions of not billions of people in a few years or more realistically, cause extreme levels of violence to undo it.

Indeed, I imagine anyone who actually managed to do such a thing would be violently murdered by the public and their death celebrated for centuries.