“The politics of this were impossible a few years ago. But not so much now,” said Rafe Pomerance, chairman of the environmental alliance Arctic 21 and a four-decade advocate of increased action on global warming. “If we think the problem of climate change is catastrophic, how can we say that we can’t at least consider this as an option?” ...
Researchers have envisioned duplicating the phenomenon by launching jets equipped to fly to 70,000 feet, the lower reaches of the stratosphere, where they would release a sulfur compound. The effort would bleach blue skies a lighter color and make sunsets more vivid, while shielding Earth from some of the sun's rays. The flights would have to be numerous and long-running to create anything like the reflective power of the volcanic eruptions.
In the journal, the team wrote: “Through high-precision airborne measurements and atmospheric dispersion modelling, we show that Katla, a highly hazardous subglacial volcano which last erupted 100 years ago, is one of the largest volcanic sources of CO2 on Earth, releasing up to five percent of total global volcanic emissions.”
University of Colorado professor Roger Pielke, Jr. recently published a paper on the problems with the UN’s use of BECCS to sell the Paris climate accord. “Carbon dioxide removal at massive scale is science fiction — like a light saber, incredible but not real,” Pielke wrote.