Beneath WALL-E’s whimsical surface lies a grown up, cautionary tale about humanity’s relationship with the environment. Carl Zimmer hosts leading scientists Mitchell Joachim, Christopher McKay and Ben Schwegler as they explore ingenious strategies for creating a sustainable future — from ‘carborexic’ cities made entirely from recycled trash to how the pursuit of “green” space exploration may one day help to revolutionize waste management here on Earth.