As I was reading a magazine the other day, I came across this "info-ad" from Toyota promoting their hybrid and alternative fuel cars and their roadmap of cars for the next several years. It got me fired up on this topic again. I'm not a huge fan of hybrid cars, but I'm not a hater either. In fact, two of the engineers I work with own a Prius. They each own one - they don't share the same one. So this rant is not about discouraging you from buying a hybrid or alternative vehicle. My point is that you need to be realistic as you make that choice and think about the long term consequences of your decisions and actions.
First of all, don't kid yourself that you are single-handedly saving the environment by buying a hybrid car. Actually, hybrid cars may help the environment somewhat, but maybe not once you factor in the whole "lots of batteries" dilemma. All you've done is trade in gasoline emissions for lithium ions or nickel metal hydride and all the emissions and by-products that are a result of producing batteries. I am not educated enough yet to know what all those by-products are, but I'm sure there are some. The law of Murphy pretty much says there will be. If you want to pay extra during your purchase to buy a hybrid car to save some gas money to balance out the extra you paid up front, then I say go for it. It should be a net savings as long as the batteries in the car last longer than 5 or 6 years. Plus, you have the added bonus of feeling good about being an early adopter.
Now electric vehicles....that's another ball of wax. First of all, you have the same battery problem that hybrids have, possibly a larger one. Secondly, if everybody had an electric car, the power grid would not be able to support them. Maybe in time the grid can be beefed up to support more electric cars, but that won't come without expense to you. Your power company and/or taxes will ensure that. Or you will need to put up a windmill in your backyard to support it. Are you willing to pay that expense? Are you willing to support your government as they approve the building of a bunch of power plants? Is it OK if they build them near your house? What method of power generation are you willing to support? Coal? Oil? Nuclear? Natural Gas? Hydroelectric? FYI, right now solar and wind by themselves won't cut it, so you'll have to choose some of those other ones too. But, if you want to be an early adopter, I say go for it.
The other great white hope is hydrogen and the hydrogen fuel cell. They like to advertise that the only by-product of burning hydrogen is water. That is true as long as you stay focused only on what comes out the tailpipe. If you step back and take a look at the big picture, some thornier issues emerge. The most obvious issue is that hydrogen by itself does not occur naturally in nature. To isolate hydrogen by itself, you have to supply energy. In fact, the most common and cheapest way (speaking relatively) to produce hydrogen (steam reforming using methane) produces greenhouse gases. The more costly way to produce hydrogen (electrolysis) doesn't have any emissions but oxygen, but again it's expensive, and you have to put energy into the process to get hydrogen. Where do you think you're going to get that energy? You guessed it, from all the old sources I already mentioned. If you like to be progressive and an early adopter, then I say go for it.
I'm sure there will be some ingenious ideas that will come along and eventually solve many of these problems, and I hope I'm alive to see them. But, the law of conservation says that as you solve those problems, there will always be unintended consequences that you weren't able to predict. That's all I'm saying. Will it make things worse or better? We'll have to wait and see.