It turns out that there are good veggie burgers and bad veggie burgers. A study by the Cornucopia Institute says that non-organic veggie burgers often contains the neurotoxin hexane, a petroleum byproduct that is bad for those who work with it and can cause explosions in wastewater and is an air pollutant.
The bottom line is that you should "look for Boca Burgers "Made with organic soy"; Helen's Kitchen; Morningstar "Made with organic"; Superburgers by Turtle Island; Tofurky and Wildwood."
Here's a report from Change.org's Sustainable Food blog. Thanks to Ramin Ganeshram and Jean Paul Vellotti.