There are far too many humans in the world at present. The Earth needs to reduce that number to sustainable levels. By humans disregarding the problems of global warming, there will be global famines which will reduce human numbers markedly.
Climate change is merely a symptom of TOO MANY HUMANS. It's pointless trying to reduce climate change without trying to reduce human numbers.
We have a choice: reduce human numbers ourselves down to around 1-2 billion (possibly with a 'One child per woman' policy which would do the task without trauma) or have the number reduced forcibly (perhaps via the global famines or water-wars which will occur when climate change causes droughts and low water supplies).
Being humans, we'll do nothing and be forced to undergo the trauma of having our numbers reduced forcibly.