Go ahead and alter the atmosphere, no one’s going to stop you — probably

A skyline at sunset in Mexico City, Mexico, Lomas de Chapultepec.| Photo by Jeffrey Greenberg / Universal Images Group via Getty Images A de facto moratorium on solar geoengineering will stay in place after heated talks at the United Nations Environment Assembly ended in a stalemate. The debate is over whether to let people launch particles into the sky that would reflect sunlight back into space, ostensibly cooling down the planet.It’s a hotly contested tactic for tackling climate change.