2,4 D is one of the three main pesticides used today in the US.  This chemical was originally created during WWII and was one of the main ingredients of Agent Orange.  The use of this chemical was seen to cause lymphoma, and is now thought to cause increased birth defects.  This article shows pictures of all of the different types of lawn products that use this harmful chemical.  The author of this article also tries to convince people to get involved to ban this harmful pesticide from being used in products.  Action had been taken in 2008 to try and petition the ban on 2,4 D, but the EPA has not done anything about this petition for almost 4 years.  This has caused the council that created the petition to file a lawsuit against the EPA.