Why do we need to currently develop large scale storage? That is only needed for full renewable grid and we are long way from that. The current answer to storag

Why do we need to currently develop large scale storage? That is only needed for full renewable grid and we are long way from that. The current answer to storage are natural gas power plants which emit CO2. We should be comparing the feasibility of storage to those. It is much better to use today's money to build more renewables instead of wasting it on expensive storage. Some storage makes sense to reduce the evening peak. But we will have a better idea of what storage we need, and what storage is cheapest to build in a decade when there are a lot more renewables.