While it is true that heavy duty trucks do use a lot more fuel than an automobile, let's look at some facts and then we can see what the trucking industry trends are with respect to protecting our planet.
The chart below shows the Top Ten Sources of U.S. GHG Emissions in 2005.

Coal burning, such as power plants, are the highest polluter of our air and represent 29% of the GHG emmissions. Passenger Cars are second with 17%. Medium and Heavy trucks represent 5%. Power plants also represent a large portion of the stationary gas and stationary oil segments.
The American Trucking Association (ATA) has announced that their new sustainability program has the capability to reduce trucking's carbon footprint by 19% or 900 million tons over the next 10 years.
The more fuel efficient and lower sulpher emitting engines, as well as better truck idling practices will make up the majority of these improvements.
In yet another move towards cleaning up the environment and the relationship of trucking, Navistar recently announced their new electric truck that can go 100 miles on a single charge. Once the charge has been spent, it takes 6 hours to recharge, and the batteries can be switched out in 15 minutes with it's "cassette" like construction.
For a link to the ATA website, click here
It looks like we are on the way for a cleaner environment. For an example of a currently heavy duty electric truck, see the video below.

