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Hamburg Voters Approve Binding 2040 Climate Target in Referendum

City leaders pledged to implement the decision under a two-year transition and said success will depend on federal policy support.

Overview

  • The measure passed with 53.1% support and 303,422 yes votes, clearing the 20% quorum, with turnout at 43.7% and a heavy share of mail ballots.
  • The law requires annual emissions caps, yearly monitoring and social-compatibility checks, with annual estimates starting in 2026 and potential corrective programmes from late 2027 if targets are missed.
  • The Senat and Bürgerschaft must amend the Klimaschutzgesetz and update the climate plan, and Mayor Peter Tschentscher confirmed a two-year legal window to translate the rules into policy.
  • A city-commissioned study says reaching the goal entails replacing all gas and oil boilers and retiring the gas grid by 2040, accelerating building retrofits, citywide 30 km/h, full transport electrification, port environmental zones and an industry switch to hydrogen and e-fuels.
  • Backers included Fridays for Future, major environmental groups and ver.di, while SPD, CDU and AfD and business associations warned of high costs and risks; a separate basic-income trial was rejected with 62.6% no.