Here's a nice example of the vital distinction between consumption and efficiency. If I told you that a company was about to introduce a new car model that was expected to average 56 miles per gallon, and that it was going to be so cheap that nearly anyone could afford one, that would sound like great news, wouldn't it? Perhaps it depends on the context in which that car is introduced, and our assumptions about what it will displace. The car in question is Tata Motors' eagerly-awaited "1-Lakh" car--referring to its 100,000 Rupees price equating to $2546 at yesterday's exchange rate--and the target market is millions of Indians who haven't been able to afford a car yet. Even at an expected efficiency of 56 mpg, though, the Nano, to give its proper name, will create incremental consumption of petroleum products and new greenhouse gases emissions.