Truth is, nobody can PROVE global warming exists. Much of the 'you cant prove global warming' debate came from the US government (when Clinton realized that Congress would never go for getting into the Kyoto protocol), as well as the oil companies. Just like the recent 'my Hummer is more environmental than your Prius' argument (which was then debunked by many major research institutions like MIT), if you trace the funding to the source, you will find out that those put into positions to claim 'global warming is a myth' have never even done an actual scientific paper on the subject. In a recent research ON research (Ill dig up the exact report... I read it recently and it will take me a little to find), 10,000 scientific papers from the past 7 years on the environment were sampled. This sampling represents about 10% of the current research in the world. Of them, not one sided with the 'anti-global-warming' ideas.
Recently, some of the oil companies have pulled funding from these organizations (some that they themselves created in the first place to fund research against global warming). I think only Exxon-Mobil still spends billions on the 'anti-global warming' marketing.
Its simple for me. Sure, you cant prove global warming, but do we really want to risk it and find out we are wrong, and that we picked the wrong side? I think conservatives love 'global warming' more than liberals (if thats how you think it breaks down across political lines), because its the only environmental issue they can seemingly win with a simple argument or two. I think environmentalists picked the wrong battle on this one though, and have allowed themselves to be baited into an argument that they really cant win. They could have picked one of a hundred other reasons for concern with the environment, oceanic acidification, global dimming, acid rain, smog, etc... and their cause would have been easy to justify, end of story.
I think its also sort of funny how most of the 'you cant prove global warming exists' people are midwesterners (and of course Americans, because we are the target audience for the anti-global warming propaganda) who havent really seen any huge environmental changes in their lifetime. Perhaps some older fisherman around the Great Lakes or on the big rivers might tell you about when they could eat what they caught... but on a daily basis, we see little of the impact compared to those who live on the shores... places where a mojority of the protein consumed comes from the ocean, or where one can dive into the ocean and see first hand what is going on. We dont realize that 50%+ of the oxygen we breathe is produced by phytoplankton... "out of sight, out of mind."
I love the rising cost of oil actually. I hear $7 a gallon by 2010. I think this, along with the awareness that pumping $1 billion a day into the middle east for 1/3 of our oil ISNT good for national security will provide the incentives needed to migrate to other technologies. As for what it will be, I bet it will be mostly electric, with bio-diesel and hydrogen fuel cells (in a battery form though, not for combustion) will be the solution. 80% of all daily commutes are under 50 miles. So with series/plug-in hybrids of a 50 mile range, 80% of the nation could get away with no oil (for transportation)use on a daily basis. If one could plug in at work to charge, this would mean 100 miles and over 90% of all daily commutes would be electric. Now I have heard all the 'were just transferring the demand to the electric grid' arguments, and this simply isnt true.
Most users would charge after work, overnight, when many turbines are shut off from their 'peak use' during the day. For the entire US to charge their cars overnight would require NO additional power plants, simply leaving the existing ones on longer. Also, many do not realize how much more efficient electric motors are compared to gas/combustion which are only about 10-15% at best at getting all the potential energy from gas. Many electrics are upwards of 90% efficient at using the stored energy in a battery. This is the idea behind the 'GM volt' concept car. The car is really driven by electric motors in the wheels, and a battery that you can plug and be 100% electric for the first 50 miles. Really, its 100% electric forever though. When the battery runs out, the gas generator comes on, but it runs at peak efficiency (gas engines are much more efficient when designed and run at only one speed, unlike how most cars are now). Then this generator charges the batteries and you keep going. Because the gas engine can be tuned for peak efficiency (a narrow torque peak, low hp, etc), it can in turn translate into 2-3x the gas efficiency by letting the electric motors translate that to the pavement. Also, charging a car for the first 50 miles like that would only use about $.50-1.00 in electricity... less energy than running a 10,000BTU AC overnight. So as you can see, electric is a win-win all around. Auto makers dread the 100% electric car (why GM killed the EV1) because it means they lose their additional income from parts and service down the road (VW boasts this division to be one of their best performing, but advertising this openly to the public might raise concern for their reliability). The bigger the engine, the more can go wrong too, so Hummers are more profitable in parts and upkeep. An electric car has no gearbox (flat torque from 0-12,000 rpm), no distributor, no alternator, no sparkplugs, no oil, etc... the only upkeep is the brakes (and the motors in the wheels use regenerative/magnetic braking to recharge the batteries a little and offset alot of the wear on the brakes) and replacing the tires. The electric cells get checked and replaced as needed, perhaps evern 100,000 miles... but its a huge hit to take considering a $30,000 car often generates another $20k in parts and upkeep over 5 years. Electric motors dont experience wear and tear either... you could go a million miles and never change a thing. None the less, Nissan, Renault, and now Mitsubishi have all promised 100% electric cars by 2010 (and some cool ones too). This joins cars like the Tesla, Lightning, Fisker Karma, Venture One, ZAP Alias, and other smaller electric car companies to really make it mainstream. Nissan wants to introduce the Maxim (look it up, it looks cool even) in 2010. The goals are 250-350 mile range (depends on the tech by the time it comes out, but they are looking at A123 and nanosafe batteries right now), 0-60 in 5 seconds (oh, yeah, the flat torque response of electric motors makes them wicked fast.... like the Wrightspeed X1), $25,000 cost, 10 minute recharge, and a LIFETIME warranty. Wicked. I predict that unless your gas driven car gets 40mpg or better, it will be up on blocks in 5 years.
So, environmental debates aside, I think automobile output can be taken off the 'list of concerns' in years to come. There are people right now who charge their cars on solar panels after all (look on Tesla's site for one example) so their cars are true zero impact.