A Set of Three Technologies Will Save Mankindfrom Climate Change in theMost Inexpensive Way Possible

This paper formulates a set of three technologies that should deal with the greatestthreat to mankind—climate change at the lowest cost. The main technology will be “SunnyRain”. It considers technology to prevent eruptions of submarine volcanoes at shallow depthsand technologies that provide scalable and impactful solutions to reduce carbon emissions acrossdiverse industries as complementary technologies used to reduce cost. A list of submarinevolcanoes at shallow depths that are likely to spew waterborne dust into the atmosphere hasbegun to be created. If the governments of Japan, Italy, and Greece, which have submarinevolcanoes at shallow depths (Kiki, Marsili, Columbo), prevent eruptions of these volcanoes, itwill provide electricity to these countries, save many of their citizens from death, and savehumanity from the greatest threat—climate change—in the most inexpensive way possible!