- Tuesday is the second day of the COP21 climate change summit
- Countries know that battling climate change is in their interest and not just a moral responsibility, Christiana Figueres says
- That makes this conference "fundamentally different" from all others before it, she says
(CNN)Leaders gathered in Paris to forge a deal on climate change are acting out of economic self-interest, not a desire to "save the planet," U.N. Climate Chief Christiana Figueres told CNN's Christiane Amanpour on Tuesday.