@ Alchemy- There is much more at work than just the Milankovitch cycles when it comes to climate change. While humans do not affect the Milankovitch cycles, people affect albedo (reflection of solar radiation into space by ice sheets and glaciers) and atmospheric greenhouse gas concentration. By increasing the greenhouse gases in the atmosphere through the burning of fossil fuels, we are creating a barrier for heat radiating from the earth to return to space. This in turn causes higher surface and ocean temperatures, which increase the melting of polar ice caps. This leads to higher melting and more ice caps, in turn leading to more melting. You now have caused a mutation in the climate cycle; changing it from a negative feedback cycle to a positive feedback cycle. This has also happened in such a short period in the planets history that could mean unprecedented changes in an already capricious climate. My point is that nature is not benign; rather it has limits, and may even be somewhat fragile in certain respects.