Colorado lawmakers pulled back plans to counter a proposed constitutional amendment guaranteeing the right of consumers to use natural gas. The bill’s backers said the legislation would not have significantly affected the initiative’s impact, even as debate intensifies among environmental groups, the oil and gas industry and policymakers. The bill — initially planned by House Speaker Julie McCluskie, D‑Dillon, Majority Leader Jennifer Bacon, D‑Denver, and Sen. Lisa Cutter, D‑Evergreen — would have addressed how the ballot measure might affect the state’s air quality. Bacon said the initiative’s wording is overly broad and could create unintended consequences. The proposed constitutional amendment , introduced by the advocacy organization Advance Colorado, seeks to establish a right for consumers to purchase natural gas and for distributors and utilities to sell it to homes and businesses. As of Tuesday, it has about two-thirds of the required number of signatures to get on the ballot.…