Oil industry advocates claim that by 2015 the Barnett Shale may be responsible for more than 108,000 jobs. Critics say that tax revenues may be offset by cleanup costs for toxic byproducts of gas drilling, such as benzene and naturally occurring radioactive material (NORM). Environmental groups have pressured state regulators to begin forcing cleanups. The San Juan Citizens Alliance has sued to force the EPA to tighten regulations. Ed Ireland, of the Barnett Shale Energy Council (an industry advocacy group) has said that he believes regulation will increase under the Obama administration; as of 2012, this has not been the case.