Great up through the last sentence. "Climate" is a thing that is always changing, on many different time cycles, from months through milenia (variant spelling, as proper as jewellery and fulness). And some climates in Earth's history would be impossible for humans to survive for any number of years, nearly all would die. But that's nature, not man doing the change. Man's changes, even today are dwarfed (is that politically correct to use that modifier, dwarfed?) by at least four other factors which are perfectly natural: (1) The sun and it cycles and winds. (2) Botany: the huge feedback loops of things that grow, many plants and plankton sized stuff. (3) Ocean flows, currents, chemistry -- and the weathering of dry land to a lesser degree. (4) Volcanism.