Alex Steffen (born c. 1968 in Oakland, California)[1][2] is an American futurist[3] and advocate of 'bright green environmentalism' who writes and speaks about sustainability and the future of the planet. He emphasizes the importance of imagining persuasive, positive possible futures: "It's literally true that we can't build what we can't imagine,... The fact that we haven't compellingly imagined a thriving, dynamic, sustainable world is a major reason we don't already live in one."[4]
Alex Steffen ... the 41-year-old
Alex Steffen, the executive editor of www.worldchanging.com, ... Mr. Steffen, 40