doesn't add up now in terms of the total aggregation of national commitments by all the economies represented here in paris, to the amount necessary to keep temperature increases within two degrees, we now have a mechanism with a review in five year's time to see is the math setting up? if it's not, to go back and ask for higher commitments, or greater compliance with existing commitments. if you didn't have that, then i fear this would be a hallow document. >> and the president said new technology could speed up the targets and getting to the two degrees faster than imagined. >> i think that's true. there's a lot of fear around the changes necessary to give effect to real climate change action. the bottom line is technology is evolving. we still need the moon shot on solar energy storage. but if we cross some of those