Europe is developing sun plasma reactor.
It works like the sun by making heavier atoms. It releases energy. An exothermic process because helium is more stable than hydrogen. You invest less energy to hold the helium atom together than hydrogen.
It is global wobbling. Global wobbling is the factor for cold and hot ages.https://en.wikipedia.org/wiki/Milankovitch_cycles
It is a theory that the way the earth moves in space over millions of years is actually making the cycle of cold / hot ages. There are very few explanations why climate changes is cyclic.
Edited 9/7/2015 23:53:25