They won't stop until every tree is cut down, every animal is killed, every body of water is polluted, and the air is nothing but poison.
This sounds like the plot in some super hero style cartoon. The bad guy is doing bad things. Why? No reason. Just because he's a bad guy. This plot doesn't play well in reality. There is the risk vs. reward element, even with evil bad guys.
No doubt your list that results in no trees, no animals, no clean water, and no air to breath would carry a huge risk. However, nothing on your list offers up an award. So, there's no point within the confines of reality. Only in your cartoon world. Get out expand your news sources and learn.