I propose that runners are a major contributor to global climate change and expel huge amounts of carbon. Think about how much carbon dioxide each runner expels during just a single run and multiply that by billions of runners and many runs per year. And then there is also the carbon released from making all that excess food consumed by runners and to manufacture all those gear!
PEOPLE! STOP RUNNING! YOU ARE KILLING OUR PLANET! Choose lower carbon activities like walking instead! No one needs to run!