The Examiner2012-06-30: This year started out with calls from the field of Republican presidential candidates to throw out the Environmental Protection Agency and turn back the clock on decades of pollution control regulations that have led to the cleaner air and water enjoyed by many today. The now heir-apparent to the Republican nomination, Mitt Romney, has at least voiced support for the EPA, though he, too, said he would roll back regulations if elected. In January, to the relief of environmentalists, President Obama refused to approve the northern route of the TransCanada Corp. Keystone XL pipeline,