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 greatest threat to mankind-climate change at the lowest cost.The main technology will be "Sunny Rain".It considers technology to prevent eruptions of submarine volcanoes at shallow depths and technologies that provide scalable and impactful solutions to reduce carbon emissions across diverse industries as complementary technologies used to reduce cost.A list of submarine volcanoes at shallow depths that are likely to spew waterborne dust into the atmosphere has begun to be created.If the governments of Japan, Italy, and Greece, which have submarine volcanoes at shallow depths (Kiki, Marsili, Columbo), prevent eruptions of these volcanoes, it will provide electricity to these countries, save many of their citizens from death, and save humanity from the greatest threat-climate change-in the most inexpensive way possible!Key words: Fighting climate change at minimal cost, Sunny Rain, technology to prevent eruptions of submarine volcanoes at shallow depths.