We don't have enough lithium for DT fusion then, either. If we assume fusion reactors have a wall loading of 1 MW/m^2, and assume 50 cm of LiPb in the blanket, then fusion reactors capable of supply (as heat) 10 TW would need the 6Li from 80 million tonnes of lithium. Current Li reserves are a fraction of this.

That ARC reactor design, if extended to world energy demand, would require 100x known beryllium resources.