Solar Cycle, decadal Water oscillations, and probably even greenhouse emissions is very simplistic of view of the world, I think. There is expanded communication happening now on awesome levels and even our ability to view the universe is 10,000x greater than before. This is a point in human consciousness evolution that history doesn't really have a point of reference for, shifting into new energy fields, dream perception, or something... new the Earth's warming is just a really measurable part of it.