No government in the world has the funds to give developing countries full aid for their transition to clean energy and climate-friendly practices. The UN should be reaching out to development banks that use government funds to encourage economic growth instead. Those same institutions could provide loans that would reduce the risk to private investors. This is the most pragmatic approach the global community and international development system can likely take at the present time.
Historically speaking, wealthy nations have raided foreign countries and exploited the land and the people for their own benefit. Those same nations are now responsible for the damage done in these countries and the damage done to the climate from their pillaging of the Earth. International distributive justice is the only path forward to rebuild the colonized and marginalized countries that are now being ravaged by the impacts of reckless actions and poor choices made by wealthy giants.