When it comes to coal fired electric plants, here in USA, Europe, and other parts of the developed world, there are standards for "flue gas desulfurization" which result in only water vapor and CO2 out of the stacks.
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Flue-gas desulfurization (
FGD) is a set of technologies used to remove
sulfur dioxide (SO2) from
exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur oxide emitting processes such as waste
incineration.
...
Flue-gas desulfurization - Wikipedia
Alas, places like CCP China and India don't use these scrubbers.
Then we find idiots like this;
Startup Says It's Started Releasing Chemical Into Atmosphere to Dim Sun
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A small environmental startup called Make Sunsets has started injecting sulfur dioxide particles into the stratosphere in an effort to ever-so-slightly cool the planet, a provocative and unproven method of combating a growing climate crisis.
As
The Washington Post reports, the company's CEO and founder Luke Iseman released six-foot helium balloons filled with sulfur dioxide over Baja California in Mexico last year.
The goal was to have the balloons release sulfur dioxide particles at high altitudes, reflecting the Sun's heating rays back into space, a process commonly referred to as solar geoengineering.
According to
MIT Technology Review, the stunt — despite its tiny scale and unsophisticated methodology — likely marked the first time anyone has actually attempted such a feat.
"We joke slash not joke that this is partly a company and partly a cult," Iseman told
MIT Tech late last year.
Make Sunsets is blazing ahead despite plenty of criticism and uproar over previous geoengineering efforts. For one, as critics are quick to point out, we don't even know if the idea will work — or if it could have unintended consequences.
"The current state of science is not good enough... to either reject, or to accept, let alone implement" solar geoengineering, Janos Pasztor, executive director of the Carnegie Climate Governance Initiative, told
MIT Tech in an email, adding that it is a "very bad idea."
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The USA EPA started to mandate (by Law) about 40+ years ago that USA coal (and "fossil") fuel electric power plants reduce their sulfur dioxide(SO2) emissions to as close to zero as possible. For those not up to speed on their science, atmospheric SO2 is the source of acid rain.
Then we get yahoos like those in the article above, who are ignorant of science and environmental laws and so far not getting punished or made to stop.
Another sign of what both sides of the issue are dealing with.
BTW, the author of that article is also not fully informed either.