Are supporters of the Paris Agreement still correct that it's the first truly global step

toward a sustainable future, or our critics write that the pact is not nearly ambitious enough?

Climate One conversations with oil companies and environmentalists,

Republicans and Democrats, are recorded before a live audience and hosted by Greg Dalton.

I'm Devin Strolovich.

The Paris Agreement was finalized on December 12, 2015.

The accord of Paris for the climate is accepted.

World leaders raise their arms in triumph as nearly every country in the world agreed that climate change is a problem,

it's caused by human activity, and it needs to be addressed. Three years later, is the deal flourishing or floundering?

I guess we've made it through the terrible twos is one way of thinking about that question.

Catherine Mock is senior research scientist at Stanford University

and an adjunct assistant professor at Carnegie Mellon University.

She was also a co-leader of the IPCC working group on impacts, adaptation, and vulnerability.

If 30 years from now we look back and say the Paris Agreement was successful, largely,

it will be because it has provided predictability to enable all of the other bottom-up action.

But if you really want to say, are we doing enough? The answer, hands down, still is no.

So what happens if the world doesn't meet its ambitious Paris commitments?

I think that there's a risk when we frame this as a binary challenge, that either we get

to one and a half degrees or we're cooked.

Trevor Hauser is partner at the Rhodium Group, where his team focuses on analyzing the economic

risks of global climate change.

He's also served as a senior advisor at the US State Department, where he worked on the

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