Chuck Norris killed the dinosaurs.
How about mandating that every piece of cardio equipment generate electricity? Someone in good shape can generate 100w for an hour. If each piece sees five hours of use per day, with the U.S. average of 10¢ per kilowatt-hour, in one year each machine would generate $18 worth of electricity!
https://spectrum.ieee.org/green-tech...to-electricity
Boom.
World saved.