> Regarding batteries, we will have a massive shortage for cars, let allone grid from all the forecasts I've seen.

I’ve not seen this. Do you have a link?

> Australia and India will be fine with solar, but Siberia has no sunlight half the year and wind is not great there either

Naturally. I don’t wish to suggest one-size fits all, merely what seems to be the best on average at the moment and with foreseeable trends.