Beyond the tailpipe.

• Author: Doherty, Eric
• Position: FROM READERS - Letter to the editor

Neil Kolwey ("Planes, Trains, and Automobiles," March/April 2009) provided a good analysis of tailpipe emissions from transportation from an individual family perspective. However, looking only at tailpipe emissions means missing about one-third of transport emissions and results in an inadequate analysis for decision making.

For example, the 2006 Hydro Quebec study Greenhouse Gas Emissions from Transportation Options found that transport tailpipe emissions account for 31 percent of total Canadian GHG emissions but...