Overpopulation will kill everybody.
Man-made Pollution is going to kill us - and all wildlife.
Fish stocks in the ocean will be gone by 2000.
We'll be out of oil sometime in the 1990s.
My personal favorite:"The Next Ice Age".
Since then, we've had Ozone holes, AID's epidemics, Bird Flu.... the list goes on.
The only thing all of these "problems" have in common is this:
NONE of them happened - Not one.
Now, add to that a study of Climate history and one will find that, since the earth cooled, The climate has been changing. I have Palm Tree Fossils from the Mountains of West Virginia - there's no palm trees there now.
We've had anywhere from 5-20 "mass extinction events" on this planet - depending on your school of thought. We have had at least 6 Ice Ages.
In between the Ice Ages - which is where we are now - we have had periods of much higher temperatures.
None of this was man-made.
Everyday, we have a warming and cooling cycle - we call it a "day & night".
Every year, we have a warming and cooling cycle - we call it "summer & winter".
Now, suddenly we happen to live in a time where we can "notice" the 1500 year long heating and cooling cycle - and we're doomed.
And, not only are we doomed - it's also "our fault"
No, we're not doomed.
And no it's not "our fault".
It is no more "our fault" than the daily and yearly cycles are "our fault". And, even if this bigger cycle would kill us (which it won't), we can no more stop it than we could stop summer from arriving.
Nor would we want to.
Could you imagine the devastation that would occur if we could stop the tilt of the earth on it's axis in order to prevent winter??? It would be 10 times worse than the effects of winter itself. Back in the old days, before science learned a few things, a comet would appear in the sky or a volcano would explode and the natives would think "we made the Gods angry" and they would go and cut out the hearts of a few perfectly good virgins or burn them alive on the altar.
Now, we know that the natives didn't have the power "to make the gods angry", and what was happening was a natural occurrence.
Not surprisingly, most of the time, the leaders of these people knew that the sacrifices actually did nothing to appease the Gods either - but it sure helped them keep hold of thier power-base.
Fast forward 2000 or so years and just look at new sophistication. Oh, sorry, there IS no new sophistication. The natives are doing the same thing!!
The climate is changing. We don't "understand it". Our leaders tell us it is because "the Gods are angry at our evil SUV's and our evil indulgent lifestyles".
Our only "new sophistication" comes from knowing that sacrifing virgins won't do anything. Instead, we'll install new laws to tax and cripple the best economies in the world - while, once again, cementing the hold on power by those in charge.
Same ploys, same tactics, slightly different parameters - and the natives STILL fall for it. Amazing.
The only thing that would cause me to worry is if the climate ever stopped changing.
Mars is undergoing "global warming". Experts believe Pluto is also undergoing "Global warming". Hmm.... what's the common thread.
Could it be this: 
As I have said many times, look around. Think for yourself. Follow the money. When one has a car inspected to get tags and registration, they ALWAYS find something wrong. Why, there's no money in not finding anything wrong. Same thing holds true in Climatology - only the dollar amounts are much, much bigger. So relax, enjoy the warmer weather. Grow more tropical plants. I myself, have 6 palm trees in my yard in Maryland. They're doing great! And, call me vile, but I am smugly happy about it.
