The most-mentioned figure for finance need is the developed countries' commitment to provide USD 100 billion per year by 2020 to support developing countries' efforts in mitigation and adaptation. Negotiations will start in 2021 on updating this amount for 2025. While sometimes thought to represent the actual cost of responding to climate change in developing countries, this is not the case. More recent estimates of the global cost of adaptation by 2030 across developed and developing countries range between about USD 80 and 300 billion per year.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report