Glenn
My anthropology final paper was about how human society is balanced on the knife edge of technology. Human society becomes more and more technology dependent. What would happen if the northeast power grid went down instead of the brown out? How long would it take for 95% of people in New York City to perish without electricity? There would be no water, no lights, no cooking, food would disappear quickly and transportation out of the city would be at a standstill. It would not take a yellowstone volcano to blast the human race back to the stone ages. A simple EMP pulse would wipe out communications, power grids, car, home wiring and appliances. Medical devices would stop etc. Humans will be very lucky to reach ten billion before global warming, or before the species is decimated by biological agents.

However the Earth is in an interglacial period and has been on a warming trend for thousands of years and it WILL probably get up a high enough temperature to kill most of the humans, there won't be enough time to adapt. After the humans are gone the temperature will continue to go up, and eventually the Earth will be mostly covered with ice again.

The fact that we have no leadership and no concensus may be a good thing in disguise. Only governments have the resources to really screw things up.
Jim YMMV
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These are my own opinions based on wisdom earned through many wrong decisions. Your mileage may vary.