"… ket return, it is a drop in the bucket considering the payoff they get,” John Walke, the clean air director of the environmental advocacy group, the Natural R …"

"… a person who controls the purse strings for the Republican Party,” said John Walke, who was a high-ranking air quality official in the Clinton administration …"

"… , what it does not represent, how it is used and important data caveats.”John Walke, clean air director at the Natural Resources Defense Council, said publica …"

"… lost workdays, and $78 billion in total costs to the U.S. economy in 2011.John Walke, clean air director at the NRDC, said the group acknowledges that companie …"