Prof Hans Joachim Schellnhuber from Germany has won the 2017 Blue Planet Prize for establishing a new field of science ‘Earth System Analysis’ and introducing most influential concepts including the notion of tipping elements in the climate system in Tokyo. He is Director of the Potsdam Institute for Climate Impact Research (PIK). Beside him, Prof. Gretchen C. Daily (from USA) has also won the award for her work promoting practical conservation by revealing the value of nature. Each will receive a prize of 50 million yen, about $450,000. The Blue Planet Prize, which is instituted by Asahi Glass Foundation, is the world’s most prestigious award for pioneers in environmental science.