On an April day, the founder of a U.S. startup called Make Sunsets stood outside a camper van in Mexico’s Baja California and released two weather balloons containing sulfur dioxide into the air, letting them float towards the stratosphere.
Entrepreneur Luke Iseman said the sulfur dioxide in the balloons would deflect sunlight and cool the atmosphere, a controversial climate strategy known as solar geoengineering. Mexico said the launch violated its national sovereignty.
"Progress is being made... to prepare the new regulations and norms on geoengineering, that is, to advance an official Mexican standard that prohibits said activity in the national territory," Mexico’s environment ministry said in a written statement to Reuters. Agustin Avila, a senior environment ministry official, told Reuters Mexico will also try to find common ground with other countries on geoengineering at the COP global climate summit in the United Arab Emirates this year.
David Keith, a professor of applied physics and public policy at Harvard University who has dedicated much of his research to solar geoengineering, called Iseman's launch a "stunt." Last month, 60 scientists including former NASA climate scientist James Hansen signed a letter in support of further research.
“The Mexico example illustrated to us that it’s not only governance to consider whether or not to utilize it, but you need governance in the research phase,” she said. “People can’t just go all over the world and launch field experiments without some kind of oversight.”
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