You joke, but it really is Bush's fault.
His Assistant Secretary of Labor for Mine Safety:
"David Lauriski, is a long-time coal industry executive and lobbyist. Shortly after taking office, Lauriski bragged to a group of coal industry executives that his regulatory agenda "is quite a bit shorter than some past agendas." Indeed, death warrants usually tend towards brevity. Part of Lauriski's abbreviated agenda is to reduce the number of times a mining company has to sample coal dust levels inside the tunnels, a move that is certain to increase incidence of black lung disease. And yes, Lauriski wants to get rid of the chest X-ray program that tests miners for black lung disease. Lauriski also wants to slash the number of mine inspectors by 25 percent."
source - the 8th person on the list