On August 27, the economics profession lost a great man, Martin Weitzman, Professor Emeritus at Harvard University. The world has also lost a very important citizen. I was at Swarthmore College with him in the early 1960s and even then, he displayed a creative brilliance. He never became a pundit on television or in the newspapers, but in many areas of economic research he left his mark. His most important contribution, in my opinion, was in making it crystal clear that the cost of doing nothing to drastically cut carbon emissions in order to head off global warming ---no matter how uncertain the potential damages and no matter how far in the future those damages will occur will be so high that we must make the changes that reduce those emissions now. For that contribution, he deserved the Nobel Prize in economics. The entire world needed his strong voice to add support for the growing chorus --- led today by the young people of the world who have the most to lose from the inaction of the politicians – demanding action.