We need both - reduction of consumption and technological development. People who think just one or the other will be enough are deluded.
(Voluntary) reduction of consumption has the side-effect that the electorate becomes more agreeable to measures such as carbon taxes. An SUV and burger-loving electorate will never vote for them, because they would make SUVs and burgers more expensive. Without carbon taxes, there's no market mechanism to control emissions. And there's less funding for technological development or subsidies to green tech.
(Voluntary) reduction of consumption has the side-effect that the electorate becomes more agreeable to measures such as carbon taxes. An SUV and burger-loving electorate will never vote for them, because they would make SUVs and burgers more expensive. Without carbon taxes, there's no market mechanism to control emissions. And there's less funding for technological development or subsidies to green tech.