Great article, but I feel like it is basicly impossible to do 0 CO2 emissions in 2050.
I mean even if we would replace all cars with electric and used only 100% renowable energy to charge them (which this task alone seems quite impossible). There are still airplanes, huge cargo ships, heavy industry etc. where zero emissions alternatives are not even in sight yet...
It seems like we are not going to have good enough 0 emissions energy source to power planes or cargo ships in 100+ years...
Nuclear seems to be one of the ways to go, but there are obvious major risks with it.
Batteries to store electric energy have huge limits based on bacis physics. I just can not imagine airliner or cargo ship powered by batteries by 2050. We already have this technology 100+ years but it really did not improve too much during all those years.
I feel like the most impact could be done by stopping population explosion in developing countries and stopping destruction of tropical forrest etc., which are countering CO2 a lot.