Ballot Initiative 2117, or I-2117, would repeal the Climate Commitment Act of 2021 and prohibit lawmakers from passing such bills. The Climate Commitment Act, which took effect in January 2023, placed an emissions cap on major polluters, which account for an estimated three-quarters of the state's greenhouse gas emissions. Companies covered by the law must purchase an “allowance,” or carbon offset, for each ton of carbon dioxide equivalent they emit. Over time, the government provides fewer and fewer allowances, meaning the price of each individual allowance rises and polluters have more and more incentive to reduce emissions. By law, revenue from the sale of these allowances must be spent on reducing transportation emissions, improving access to public transportation, building clean energy, and improving air quality, among other things. The CCA is Washington's primary policy tool for achieving the nation's emissions reduction goals, which it signed into law in 2008 and updated in 2020 to cut greenhouse gas emissions in half by 2030 and by 95 percent by mid-century.

The other climate-related ballot initiative Let's Go Washington supports is I-2066, which purports to “stop” a currently non-existent ban on gas stoves and heaters. The initiative — a newer addition to Let's Go Washington's plan — would bar the state's energy code from “prohibiting, penalizing or discouraging” gas hookups for cooking and heating, and would strip cities, towns and state agencies of the ability to impose their own restrictions Gas in new and existing buildings. Because of the broad interpretation of a word like “discourage,” it could force lawmakers to change Seattle’s new building emissions standard as well as the state’s energy laws that incentivize new electrified construction. The measure would also repeal portions of a bill passed earlier this year that requires Washington's largest utility, Puget Sound Energy, to create a plan to reduce greenhouse gases across its gas and electric utilities.

While the Climate Commitment Act is widely viewed as a critical means of achieving the state's climate goals, there is no evidence yet on the extent to which it reduces emissions; Washington has not released data on greenhouse gas emissions since the law took effect last year. If passed, I-2066 could make achieving climate goals extremely difficult. The building sector is the second-highest emitting sector overall in Washington. Gas-powered heaters are responsible for about half of these emissions, and in Seattle they account for 90 percent.