The most meaningful step (that every politician manages to avoid) is to get rid of coal in energy production.
Putting money into solving Renewable intermitency (either through large scale storage projects or nuclear) and decommisioning every single coal plant on earth (followed closely by gas plants) would be the single largest step change in emissions that has fuck all to do with 'consumer' behaviour.
At some point we should probably start doing something – and enough – about it to maybe avoid the worst consequences?