Trump new poll shows ted cruz way ahead in iowa. Well have analysis and talk to another g. O. P. Contender, Ohio Governor john kasich. Theres other news, too. Senate intelligence chairman richard burr joins us with the latest on the Santa Barbara shooting well talk to an actual scientist about the new climate. Its all coming up on face the nation. Captioning sponsored by cbs good morning welcome to face the nation. Im john dickerson. Nearly 200 countries have signed on to a Climate Change agreement they hope will avert a global disaster. Each promise to slow Carbon Emissions towards a goal of preventing Global Temperatures from rising more than two degrees celsius or 3. 6 degrees fahrenheit above preindustrial temperature levels. These are nonbinding and theres no inr enforcement mechanism to punish those who dont keep their promise. Secretary of state john kerry, who led the u. S. Delegation, compared the effort to moving we spoke with him earlier from paris and asked him about the la