Maine Gov. Janet Mills addresses the Climate Action Summit in the United Nations General Assembly at U.N. headquarters on Sept. 23, 2019. Credit: Jason DeCrow | AP

Maine’s governor has signed an executive order requiring the state to step up investing in energy efficiency, renewable energy and emissions reductions.

Democrat Janet Mills’ order, signed Tuesday, is her latest effort to make the state a national leader in combating climate change.

Her order requires prioritizing energy and fuel efficiency for buildings and vehicles; reducing travel; and installing renewable energy generation. Mills has already installed solar panels outside the Blaine House.

Mills addressed the U.N. Climate Action Summit in September, announcing the state’s goals and challenging other states to do the same.

Under Mills, Maine has pledged to be carbon neutral by 2045.

The state has committed to reduce greenhouse gas emissions 45 percent below 1990 levels by 2030, and by at least 80 percent by 2050.