Moreover, there are processes that influence climate, such as modifications in land use, that scientists do not know how to simulate.

The?United?States?is?a?land?rich?in?mineral?resources?and?fertile?farm?soil,?together?with?a?moderate?climate.

Bones disintegrate, the land erodes, the climate changes, forests come and go, rivers change their course — and history, if not destroyed, is steadily concealed.