The BIGGEST problem with clean energy

While this is theoretically true, one must be careful not to focus on this too much regarding energy transition. Then it still acts as a whataboutism-discussion. As well as the hydrogen car one.
Right now, we simply need to massively *build Renewables* . And actually quit combustions of coal, oil and gas. Simple as that!
We need so much wind + solar power installed (6 times more than currently done). We can even waste reasonable amounts of overproduction on super windy or super sunny days (and then flexibilize the demand side first) before having to think about huge storage amounts.

And the relatively fine solution we already do have for seasonal storage: produce green gas like Hydrogen or Methane during overproduction  - even if it's done inefficiently. And burn it in gas power plants during these dark doldrums.