Net Power’s Rodney Allam stands astride his creation: a power plant that captures its own carbon, at no extra cost. (Photo by Michael Thad Carter, for Forbes).

Green Gas: the Allam Cycle technology promises a future of emissions-free fossil fuels. 

GROWING UP IN ENGLAND after World War II, “all the youngsters like me were obsessed with aircraft,” says Rodney Allam. “I had a picture on my wall of Chuck Yeager when he broke the ...