Tackling climate change effectively is going to require serious sums of money. Developing countries, many of whom are on the front-line in the battle against global warming, will require large amounts of external public finance to adapt to climate change, combat deforestation and move to low-carbon pathways out of poverty. Rich countries, who have largely caused the climate crisis through their historical greenhouse gas missions, will have to find a way to pay for the true costs of their pollution. Rich countries have amassed an enormous