One of my favorite films about aliens invading the earth is John Carpenter’s They Live. The aliens strip the earth of its resources and accelerate global climate change to change earth’s environment to that of their home planet. Some humans collaborate with the aliens and are rewarded for their betrayal with money and positions of power.
My all time favorite film about aliens transforming the planet isn't science fiction. It's the recent documentary Gasland.
The film is about what happens to the people, communities, and the environment, when natural gas is obtained by a stimulation method known as hydraulic fracturing.