What are potential hazards associated with hydraulic fracturing?

A. Volcanic eruptions associated with violatile groundwater
B. Water consumption concerns over the millions of gallons need to frack
C. Sinkhole concerns over collapsed pore space in the rock
D. Transportation hazards associated with spills and fires
E. Air pollution concerns associated with methane being released
F. Ecologic impact due to a loss of birds and bats
G. Chemical concerns leading to potential groundwater contamination