Hydrogen vs. Battery Electric Cars

Wow, only just discovered this channel - I like it a lot. Did i miss the bit where the environmental impact and cost to produce lithium batteries was mentioned? I'd be curious to know how sustainable it is - given batteries become mere paperweights over time. Can't help but feel from an environmental standpoint - hydrogen is the way to go - but it needs to develop a lot more. Bring on the Mr Fusion Flux Capacitor - or better yet, on-demand hydrogen generators.