Why is the Economics of Climate Change So Difficult and Controversial? A Max Weber Lecture by Martin Weitzman (Harvard University) Valeria Pizzini Gambetta November 4th, 2015 With an exciting and timely lecture titled “Why is the Economics of Climate Change so Difficult and Controversial?” Professor Martin Weitzman opened this academic year’s Max Weber Lectures at the European University Institute on 21 October 2015.