The Wisconsin Department of Natural Resources (DNR), controlled by Gov. Scott Walker, scrubbed from its website language that says climate change is caused by human activity and greenhouse gases, replacing it with text calling climate change a matter of of scientific debate.

The website for the agency now reads that “as it has done throughout the centuries, the earth is going through a change. The reasons for this change at this particular time in the earth’s long history are being debated and researched by academic entities outside the Department of Natural Resources.” Previously, the site attributed climate change to increases in carbon dioxide emissions and described expected impacts of warming on the Great Lakes.

When running for president, Walker mocked the threat climate poses to national security and dubbed the EPA’s Clean Power Plan the “Costly Power Plan.”