Indian car maker Tata Motors has developed the world's cheapest car, the Nano. It will probably cost around 130 000 rupees including on-road costs such as dealer charges and taxes. That is under US $3000.
Herein lies the the dilemma. Such a cheap car gives poorer families in India greater opportunities. With more cars comes congestion, pollution, use of more fossil fuels, further green house gas emissions etc
At one time, Ford's Model T sold for a similar price in today's terms, $300 in the 1920s.
Perhaps people should be discouraged from driving and owning cars.