Grocery merchants in Texas, California and New York will
soon have ice cream, frozen foods and fresh produce delivered by tractor
trailers whose refrigeration units are powered by fuel cells, a clean
technology that makes energy silently and with dramatically reduced emissions.
The fuel cells will do the work normally done by a small
diesel engine, which keeps the cargo at the proper temperature while the trucks
are making deliveries. Each of the four trucks will still be equipped with a
main diesel engine that actually powers the truck.