Creating large area clouds to reflect light to where it came from or to space could reduce global warming. Read the BBC link for more information. One suggested way is to spray a large amount of seawater into the atmosphere as shown in the picture below taken from the BBC link. They claim that the method is extremely cost-effective.
The problem that faces any large-scale modification is one of ethics. What if, it leads to other problems. It is known in many countries that improperly planned manipulation of water resources has led to either draughts or unusual inundations. I recently read an article that strongly correlates the average temperature rise in Bengaluru and the occurrences of inundations with urban development when several natural ponds and lakes were sacrificed by the builders to build high-rise apartments. The study covers several years of such abuse.
The originators of the above concept in the BBC article seem to be bugged by the problem of nozzle clogging used to spray seawater. This is probably a tractable problem.
There is enough evidence that plastics are better at not having corrosion problems compared to metals. How strong a plastic is needed? how fine a spray is needed? How soon the corrosion sets in are some of the things that need research. Special coatings can be used to modify corrosion characteristics.
Read more here: https://www.bbc.com/future
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