Causes

There is a need for an alternative fuel source in the automotive industry because:
The oil supply on the earth as we know it is diminishing,
Cars today are contributing a lot to pollution.
This pollution is causing global warming.
Gasoline is very expensive.
Gasoline isn't efficient.

The major reason I think that we should develop an alternative fuel source is that we are polluting our earth at an alarming rate. We don't know for sure exactly what is happening to the earth but if you just think about how much CO2comes our of one tail pipe in a year or what ever and then just imagine how many million cars and trucks are on the road everyday pumping out millions and millions of tons of pollution into the air. It has to go some where. I don't think it would be just floating out to space. There is evidence that shows the pollution being trapped in by the O-Zone layer or what ever. This is causing the earths climate to shift. Because of the earth not being able to cool down and the heat being trapped in the effects could be disastrous.
It may not happen in our lifetime but it will happen if we do nothing about it.