Coalition government is type of government that gets formed when majority is not achieved by a political party and as a result number of parties come togather so that they can govern by forming government.
This type of government cooperates togather by eliminating the dominance factor of any individual majority party and coming together with smaller parties for trying to work with harmony and thus, coalition is formed.This is also known as alliance government.
They help counteract the uneven distribution of solar radiation reaching Earths surface so if there was no surface current Earths surface temperature would increase to dangerous levels over time.