Every single economy, developed, developing, underdeveloped, Marxist, socialist, social welfare, mixed or full market depends on growth. Increasing population either through reproduction or immigration is the most destructive thing for the planet. That does mean more carbon, more plastic, more pollutants in general, more pavement, more disease transmission -- you name it.
The single best solution for global warming and stress on the planet in general is well understood: Higher level so education for poor women -- specially in the underdeveloped world. the more educated a woman is the longer she differs first pregnancy and the less kids she has.
This film does not address the core issues at all but is a whining, self righteous preaching to the choir so people spend a few pounds, euros or dollars to see it feel like they did something -- when they did NOTHING. The theater I saw this at in the UK was AIR CONDITIONED