Why degrowth communism could save the planet

How did an unknown Marxist scholar sell half a million copies of a book about degrowth communism in his homeland of Japan? And why is a complete transformation of our economic life necessary to save the planet?  

Guest: Kohei Saito is an associate professor at the University of Tokyo, and the youngest-ever winner of the Deutscher Memorial Prize for scholarship in the Marxist tradition. His book is Slow Down: How degrowth communism can save the earth (Hachette Australia).