What we must simultaneously do to avoid abrupt climate change and stabilize the climate:
1) Slash fossil-fuel emissions to zero. As-soon-as-possible; certainly this could be achieved by 2030; imagine, for example that the > $700 billion US annual military budget was redirected for several years to do this…
[pb, suggest you clarify that not all Energy Efficiency is about residential work, which while, just as the consumer is 70% of economic activity, nevertheless is not all. So here. This is to complete the virtual triumvirate you indicate here of: EE/SRM/CDR. dk]
2) Cool the Arctic using Solar Radiation Management (SRM) techniques that we know will work.
3) Remove CO2 from the atmosphere using human-assisted accelerated Carbon Dioxide Removal (CDR) techniques. Note that we could alternately remove the CO2 from the sea water. Lowering concentrations in either the ocean or atmosphere will cause it to lower in the other.
We have no choice, our backs are against the wall (or rather inside or even behind the wall which is very thick). All three of these actions need to be taken for humanity to have a fighting chance at maintaining ecosystems and civilizations.