One is to increase the institutional UN’s governance responsibilities, authority, legitimacy, and power. The other is to increase the amount of money that runs through UN mechanisms from rich countries to poor countries, with an administrative cut to the UN itself.
Environmentalists and climate change scientists seem sometimes unaware of the UN’s own agendas and history in these two institutional incentives. They thus seem sometimes insufficiently sensitive to the possibility that their own issue is not the first matter of apparently apocalyptic but also immediate import requiring vast changes in the global political economy that has ever seized the UN.
Climate change: the UN's hidden agendas
Eugene Volokh sees two of them: