The BIGGEST problem with clean energy

For a bunch of unproven technology there was definitely a lot of shade thrown at lithium ion batteries. 

The degradation (all systems have some, pumped hydro has evaporation, impeller wear, etc) in lithium ion is minimal and at the end of its life can be ground up and refreshed as a new battery. Plus it's the fastest response to support the grid that exists right now. In Australia their electricity costs went down by 90% from 800/month to 80/month) after lithium ion plan was installed solely due to removal of costly fast response power plants being able to close. The current mines might run out in 2080, but if tesla is correct 80-90% of all lithium in their batteries can be recycled into new batteries, which effectively means we won't ever run out