Comment period ending on Illinois 'fracking' regs
Environmentalists say thousands of comments have been submitted about the process known as hydraulic fracturing.
The Illinois Department of Natural Resources will use the comments to evaluate possible rule changes. A panel of legislators will give final approval.
Gov. Pat Quinn signed regulations into law last year that were hailed as among the toughest in the nation.
Supporters say fracking will create thousands of jobs. Opponents fear it could pollute water resources.