> On the other hand the quickest way to realistically reduce emissions by half is to reduce the population by half.

That's nonsense. A reasonable time period for halving the population naturally would be 3 generations, or about 100 years.

We already have proof it can be done faster: Britain has halved their emissions in 35 years.

We need to do a lot more than halve CO2 emissions, and we need to do it in a lot less than 100 years. The goal is net zero by 2050. And while that's a very difficult goal, it's not a completely impossible goal either.