Geoengineering means actively altering the Earth on a massive scale, and solar geoengineering means altering how the Earth and the Sun interact.
According to Popular Mechanics, the most popular theory being studied right now involves ejecting by aerosol large amounts of particulate matter into the stratosphere.
This is shocking to some, as particulate matter is a big part of what is polluting the air worldwide, and nobody understands yet how we could be sure that this matter wouldn't eventually settle back down to the Earth's surface, for example.
Naturally, because of issues such as these, not everyone is on board with this idea; many people are suspicious about the many possible horrible outcomes of such a scenario. Some people have even said it sounds like something a James Bond villain would do.
Here are some choice tweets on the subject:
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