This documentary was at its best with Paul Ehrlich and Dennis Meadows talking about overpopulation and exponential growth, which ought to be the main focus of environmental films; to discourage the view that technology will solve everything, even as the economy that produces it keeps trying to grow. A combination of more birth control and personal restraint is what could really save the Earth.
We see the usual panoply of talking heads who fought for nature, and I'm all for that, but when I saw an army of big wind turbines rising from the desert in an early scene, I was reminded that Man's "solutions" to environmental problems tend to cause more harm than good. Wind power (and solar mirror arrays) are increasingly industrializing landscapes and ocean views that other energy development wouldn't touch. They repeat the old mistake of tackling everything as a construction project to "create jobs and help the environment," but the latter never quite happens.
Allowing vast tracts of scenery and flying creatures to be destroyed for intermittent electricity is an environmental tragedy as bad as climate change. There is no easy way, if any, to eliminate fossil fuels from the economy, especially oil. All renewable energy infrastructure is built and transported with it one way or another.
I'm still waiting for a mainstream documentary that admits Man is mucking things up with so-called solutions.