"Adapting balloons into geoengineering devices may simply require mixing helium with a few kilograms of sulfur dioxide, a compound that in the stratosphere is converted into sulfuric acid, which in turn casts away heat. Pressure will build inside each balloon as it ascends, until it bursts somewhere above 20 kilometers (12 miles), scattering its contents into the atmosphere."

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Brent, Kerryn; McGee, Jeffrey; McDonald, Jan; Rohling, Eelco J. (2018): International law poses problems for negative emissions research. In Nature Climate change 8 (6), pp. 451–453. DOI: 10.1038/s41558-018-0181-2.

"New international governance arrangements that manage environmental risk and potential conflicts of interests are needed to facilitate negative emissions research that is essential to achieving the large-scale CO₂ removal implied by the Paris Agreement targets."

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"Large-scale use of sun-dimming technology could have a range of little-understood side effects, including potentially shifting Asian monsoons"

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"A new book coming out April 21 points out the major holes in national and international geoengineering regulation, and lays out a framework for improvement. The book, titled Climate Engineering and the Law, was co-edited by Michael Gerrard from Columbia's Sabin Center for Climate Change Law and Tracy Hester, a graduate of Columbia Law School who now teaches at the University of Houston Law Center. Gerrard is also chair of the faculty of the Earth Institute."

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