I never really understood the big debate over "Is Global Warming real?" or not. I personally believe it is, because, as others have stated, 99.9% of experts on the subject believe it is, and 0.01% of those who say it isn't aren't qualified to say so. But, even allowing for the possibility that the more severe recent fluctuations in heat are not human-activity caused, the major problems facing the Earth are unchanged.
The number 1 impending problem on Earth, in my opinion (and in the opinion of many experts, I might add) is not specifically global warming but rather the pressure the growing number of the planet's people, and the growing number of First-worlders in particular, are putting on the planet's available resources, which are largely being mismanaged.
In other words, there is a clear limit to how many people on Earth can have hugely wasteful, extravagant lifestyles, such as myself and 90% of people on this Forum have.
Consider that if China alone achieves First-World living standards -- which is its stated goal; and bear in mind its economy grows faster than any on Earth -- then the resource depletion on Earth to support First-world living standards will double. As many water, fishing and other resources are already largely depleted, that is a catastrophe waiting to happen.
The alternative to "letting" other parts of the world catch up to First Worlders is of course to deny them First-world standards, so that we can hog everything. Result? War and chaos.
So, I can't see any way out of complete impending chaos in the future, unless all the parts of the world find means by which to safely and responsibly manage the Earth's resources. That is the impending problem, more than global warming (which is more of a by-product of that problem -- obviously, these problems are all related).
So, unless we can collectively stop cutting down the forests, stop over-fishing what is left in the rivers and oceans, stop irresponsible farming and clear-cutting that leads to soil erosion, stop wasting fossil fuels, etc., etc, then Global Warming is the least of our worries.
In any case, taking steps to reduce Global Warming is just common sense. It shouldn't require a doomsday scenario to motivate governments to encourage resource responsibility, but it does.