Shutterstock Save for later Print Download Share LinkedIn Twitter A COP26 declaration seeking to phase out internal combustion engine vehicles as early as 2035 failed to gain signatures from large automaking countries, but it did draw support from some major manufacturers and buyers. The agreement will lend weight to growing calls for phasing out petroleum-powered vehicles in the 2030s. But climate campaigners would like to see a phaseout deadline of no later than 2030.