Given the chance humans will overrun the earth and consume every single resource until there's nothing left of this planet but dirt, stones, and people. Some countries are already like that, and the richer countries are expected to pump money and resources into these sand pits ad infinitum.
God may be able to provide through Jesus, but you may notice that he is not doing so. People are dying and starving all over the world, and if god doesn't care enough to do anything about it, then I don't consider it my responsibility, either.
On the other hand, I am living and driving on land that animals used to live on. I took this land from the animals, and I feel it's my duty to make sure there's somewhere else for them to live.
They're more moral and worthy than we are. When's the last time a bunch of deer showed up with guns and started shooting US for fun?