It proposes to reduce carbon emissions by 80 percent in Maine by the year 2050.
The bill's sponsor said it's a goal setting bill. The steps to get to that goal would be determined later by talking with stakeholders.
The lawmaker is looking toward electric cars and utilizing wind energy.
He said multiple groups came out in support of the bill at a public hearing Wednesday.
"We've had lobstermen here, the oyster people, new farmers, it's been quite an array of people who depend on our climate for their living," said Rep. Ralph Tucker, D - Brunswick.
One Republican lawmaker, Rep. Dick Campbell, R - Orrington, said he has questions about the bill, like whether Maine's carbon footprint is that harmful compared to other states.
He also said he would like to see concrete steps before supporting the bill.
Rep. Campbell said the bill, "needs to be very specific in how it can actually be effective and not just a piece of legislation we pass and put into the statute that makes us feel good."