How much better can you get by pushing production to use greener methods instead of reducing demand or changing it to something else (which would fall on person

How much better can you get by pushing production to use greener methods instead of reducing demand or changing it to something else (which would fall on personal consumer activity change or raising cost of production via say carbon tax)? Obviously there's not a clear distinction between the two, i.e. food deserts / car-only locations forcing people to make certain choices, but it seems like for most things outside of energy production meaningful improvement requires a meaningful change in downstream consumer experience/behavior.