And today and 50 years from now and very likely at least another 100 years beyond that. Prior inaction does not mean it's over. We don't get the luxury of having a "oh well we lost this round" mentality.
If you really want to curb co2 emissions significantly, the only effective way would be to nuke the USA, Europe, China and sterilize all but 5% of the remaining world population.
That is not true. The all-or-nothing mentality is why vegetarian purists do little to curb mass meat consumption. We don't need to choose between industrial society and destroying our habitat. We can have both if we're thoughtful about what indulgences we allow.
Anything else is just greenwashing at this point.