Man is not to blame. See the effect of solar output
here. The nay sayers that attempt to put done the solar effect look at sunspot activity not total solar output. Man is a speck on the surface of the planet.
The earth's rotation will continue to slow down more and more. Dino-days were shorter. And eventually we will lose more and more atmosphere to space. And the radioactive material that keeps the earths interior molten will all graceful move towards iron, and the lower magnetic field will mean even more atmosphere erosion. The surface will be very very hot. No life as we know it will live there as the temperature will be over that of boiling water, our atmosphere will be much less dense and unbreathable, and the solar radiation will not be deflected because our magnetic field will have weakened and collapsed to far. Depending on your science this is 500 million to 1 billion years off. Earth will be a lifeless rocky planet.
Generally warmer climates predicted by the global warming fanatics are in the range of normal variation, the last warming period allowed the renaissance by longer growing seasons and thus more plentiful food in Europe.
We are "overdue for an ice age" (well and a eruption of the super volcano in west central US but that's another paranoid's dream). If and it is a horrendously HUGE if, mankind is contributing to global warming, then hurrah. Just learn when to stop. Worldwide food production will increase, and contrary to intuition the desert areas will actually subside because the alterations to the weather patterns will allow for more rainfall. We owe it to mankind (and Canada) to help stop the next ice age. Not likely we can, any more than we cause global warming.
The fundamental question is not is global warming happening (as in in the 1970s the next ice age was coming, same science behind both). The question is, "Is man causing global warming?"; the answer to that is no. To many facts show the effects of man are minor in comparison to natural events, like volcanos, slides of methane hydrates under water (don't tell the doomsday makers, but the North Atlantic has enough methane in seabed ice/methane hydrates to _really_ cause global warming). We don't as a species even try to track things like the effects of undersea earthquakes as they relate to global warming. There is a lot going on. Look for the strongest correlation. Occam's razor says solar output is the biggest contributor by far to global warming. Studies that dismiss it only look at selected portions of solar activity that support their hypothesis.