zero-carbonhttp://www.oed.com/dictionary/zero-carbon_adj%3Ftab%3Dmeaning_and_usezero-carbon, adj.
First published 2018

zero-carbonadjective

  1. 1990–
    Producing, causing, or resulting in no emission, or no net emission, of carbon dioxide into the atmosphere; cf. carbon-neutral adj.
    1. 1990
      The idea of a carbon tax is simple: by applying a tax to emissions of carbon, those emissions are discouraged and the economic standing of low- or zero-carbon processes improved.
      International Affairs vol. 66 79
    2. 2008
      A carbon-neutral home, unlike a zero-carbon home, may use some fossil fuels, as long as its energy use does not result in an increase in total atmospheric carbon dioxide.
      Independent 3 September (Property section) 7/3

Originally published as part of the entry for zero, n. & adj.

zero-carbon, adj. was first published in 2018.