According to a UN report back in June:
"Significant investments are needed and international cooperation is critical. More than a decade ago, developed countries committed to jointly mobilize $100 billion per year by 2020 in support of climate action in developing countries."
Unsurprisingly the money has yet to appear. It sounds a lot but the world military expenditure is around $2000 billion per year - twenty times the amount. And that money has been spent already. And it keeps flowing.
If we could put an end to war we could divert a part of this to beneficial uses. Think of the money which could be available for fixing the world, education, health, housing for the poor and so on.
It is strange that this issue is hardly mentioned by world leaders. Why is this?