"My question is; how much of that is influenced by man as opposed to how much of it is just plain part of the natural cycles of the planet?"

Oh well, that's all right then. If it's caused by human activity, we should do something about it. But if it's natural cycles, nothing to worry about. No need for humanity to do everything it can to prevent exacerbating sea-level rising, drought, famine and forced migration. We can all relax.

Drill, baby, drill!