We need to increase capacity of renewable energy production, of course, but that is the easiest part of the whole equation. We also need serious investment into energy storage, by orders of magnitude more than what we have today. That will be at least as large an investment as building out the base capacity. And we need massive improvements to the power grid to make it possible to transmit power from where it's generated to where it's used, which will be at least as big an investment as either the capacity or storage problem.
Fortunately, all of these problems will benefit from technology advancements, and all of them can represent capital investments which provide lasting long term value (not just in CO2 emissions reductions but also in improving the resiliency of the power grid). There are tons of people working on the generation problem. The storage problem is about in the same state that generation was maybe 20+ years ago. And the grid problem? You could fit everyone working on it into a conference room, a small conference room. We desperately need to amp up investment in every aspect of this field ASAP.