"A looming federal budget confrontation and Republican hostility to UN global-warming talks threaten a U.S. down payment into a key climate-aid fund, money considered vital to a climate deal in Paris this December.

President Barack Obama had requested $500 million in the 2016 budget for the first tranche of its $3 billion pledge into a UN-administered Green Climate Fund (GCF) that would help poorer countries make a transition to clean energy technologies and adapt to climate change.

But Congressional Republicans have vowed to oppose that spending request, and the wider dispute between the President and Republicans over the federal budget has raised the possibility that Obama will not be able to guarantee that U.S. funding before the December summit. Some U.S. officials have started to warn island states and developing countries - among the fund's main potential beneficiaries - of the looming shortfall."

Valerie Volcovici reports for Reuters September 24, 2015. [2]