What's new: 2005 cars.(your letters)(Letter to the Editor)

Part of your October report "Fueling the Future," about hydrogen fuel-cell cars, is misleading. To suggest that hydrogen does not generate pollution is just not correct. You do state that hydrogen is generated via combustion of natural gas, a fossil fuel. The other way to make it is via the electrolysis of water (water splitting), which also uses mostly fossil fuels, primarily coal.

DR. JOHN ALTER BRISTOL, IN

In your enjoyable report about alternative-fuel cars, I noticed that my choice of alternative fuels was not mentioned. I bicycle to work 16 miles each way I fuel my "engine" with pizza, the ultimate alternative fuel. Bikes may not replace cars, but they are certainly an alternative. They're used for daily commuting by people around the world.

TOM OLOFSSON CHICAGO

In physics class many years ago, I learned that in an internal combustion engine more than half the energy in fuel is converted to heat energy and is released into the atmosphere. The rest is ...