An environmental group has taken its climate change battle with U.S. Sen. Ron Johnson to his Milwaukee office.

The Wisconsin League of Conservation Voters has been running television ads criticizing Johnson's opposition to the Environmental Protection Agency's Clean Power Plan. The plan targets climate change by reducing carbon emissions from coal-burning power plants.

On Tuesday, league members dropped off petition signatures and letters at the senator's office.

League spokesman Jonah Hermann said Johnson wrongly labels the Clean Power Plan a job-killer.

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"If you take a hard look at the Clean Power Plan, it actually creates tens of thousands of clean energy jobs, and a lot of those will be right here in Wisconsin," he said.

Hermann said that these jobs would be in industries like solar and wind power.

Johnson's campaign office said that left-wing operations like the League of Conservation Voters don't care how much their policies drive up electricity rates and harm Wisconsin families.