At Paris climate talks, a key question: who will fund the green energy transition?

Pillars with the names and national flags of countries attending the COP 21, UN climate conference, decorate the outside of the venue hall, on November 25, 2015, in Le Bourget, north of Paris.

Nations from around the world enter a final week of climate talks in Paris, with some key elements of the agreement still uncertain.

Nations from around the world enter their second – and final – week of climate talks in the current UN-backed summit in Paris, with some key elements of the agreement still uncertain.

On the table is a plan to cut back on carbon emissions in order to avert the worst of climate change in the coming years.

But there are other big questions still to be worked out: how will nations get to a clean energy future and who will finance such a transformation? The most recent draft version, released by the IPCC late last week, shows many sections still vaguely worded.

For more, we're joined by Cara Horowitz, she's co-director at UCLA's Emmett Institute on Climate Change and the Environment. She's joining us from Paris, where she's taking part in the summit.