Randall Krantz, an IESE alum, shares his optimism on the upcoming climate summit in Paris for which he is involved in organizing a conference of mayors.

The tragic and barbaric terror attacks in Paris have cast a deep shadow on the upcoming climate talks which will need to resolve four critical challenges.

China's report that it has used 17% more coal than earlier reported adds to the concern about reaching a climate deal in Paris next December and puts more pressure on Barak Obama to succeed where Woodrow wilson failed almost 100 years ago.