Boost renewable energy sources. Climate change is going to hurt everybody very badly if we go on the way we have been. Most people see it as a problem for the future, but it's quite possible that disasters such as the 2003 European heatwave, the 2010 Russian heatwave, and various floods and droughts in the 00s resulted in part from AGW.
In that case, the fatalities from climate change already number in the tens of thousands.
But we haven't seen anything yet, since it takes several decades for equilibrium temperature to be reached. That is, the warming is that far behind CO2 increases--so if we stopped emitting CO2 completely NOW, we'd still see warming increase for years.
We are in more trouble than we know.