I support taxing not only gasoline, but all fossil fuel carbon. It gives people an incentive to puff less carbon dioxide into our atmosphere. Taxing automotive fuels provides a firm yet flexible incentive to reduce motor fuel consumption.
Taxing motor fuels on the basis of fossil fuel carbon (but not renewable carbon) will also incentivize us to use renewable fuels such as ethanol, bio-gas derived from farm animal manure or biodiesel. So I applaud Alan Mulally and Rep. John Dingell for speaking up in favor of a gas tax -- the flexible alternative to draconian federal fuel economy requirements ("Mulally should keep up the straight talk," Aug. 10).