re: How much longer do think humanity/earth survives

Humanity is nearing the point technologically that we could deal with anything that mother nature throws at us. Even though bad things happen this is still probably the most peaceful Era in human history so the likelyhood of us destroying ourselves is decreasing compared to when we first developed the means to potentially destroy ourselves.

The earth will be here well over a billion years from now and if we get another millenia or so without a something crazy like a Yucatan type meteor hitting earth or us nuking ourselves, I think in some way shape or form our ancestors will be around even after earth.