In the rush to move the Paris climate change deal into effect, some warn that a bank looking to shell out billions of dollars to help developing countries cope with the effects of global warming may be moving too fast.

The warning is not coming from critics of the Paris deal, the GOP or presidential nominee Donald Trump, but from the climate agreement’s top supporters, including dozens of environmental and civil society groups, ahead of this week’s meeting of the Green Climate Fund in Songdo, South Korea.