The one when he says that we cannot solve the problem inspite of having 7.5 billion minds around or the one in which he claims growing the world population might solve the problem?
He was a bit confusing on that part. Increasing the birth rate in hopes of raising a genius that would save us, is not a solution. He got carried away there.
Everything else was pretty much spot on though. Given the realities we face, there is no immediate solution or acceptable action we can take to solve the 'problem'. Anything that significantly reduced our overall CO2 emissions in the next 20 years would mean reducing the population or drastically reducing the living standards of all industrialized populations. There is no one who can sell that to 'them'.
Reduction of CO2 emissions will happen, but not because of political action or hysterical preadolescent kids.
The solution will come gradually and almost invisibly to the public. It will come due to the work of scientists, engineers, industrial designers, etc doing their everyday job. Most people will not notice it happening, and haven’t noticed that it is already happening.
Gretas of the world, relax, the solution will come without your eco-rage.