Converting atmospheric CO2 into fuels could contribute to this effort. But bacterial and plant-based fuel production may still be more economical and produce fewer overall emissions than even a solar array and a carbon capture plant.
There's a reason why plans for a primarily renewable grid assume that compressed air, synthetic ammonia, giant flywheels, or something else will provide storage for orders of magnitude cheaper than batteries: because existing storage systems aren't capable of meeting the storage demands of intermittent generation. Will one of these systems deliver a storage breakthrough? Maybe. But it's not wise to bet the future of your electrical grid on a technological breakthrough that hasn't happened yet.