The author is referring to the official environmental organizations who seem to be "missing in action" on this issue.
The cleanup is still underway from a massive pipeline spill in Mayflower, Arkansas, but you don't hear anything about it at public hearings across the nation dealing with the Keystone XL (KXL) pipeline. Resolutions supporting the controversial KXL pipeline have now been introduced in seven states, but while TransCanada, the American Petroleum Institute (API) and the Chamber of Commerce have been lobbying in force for the bills to pass, there have been few opposing voices by either Democrats or environmentalists at public hearings dealing on the measures.