Elon Musk talked about how BTC mining with electricity isn't environment friendly but he invented electric cars, in near future if this actually becomes popular electric cars will be available world wide and billions of vehicles will be charged by electricity so how is this environment friendly?
It's not environmentally friendly if you use government-provided electricity, but if you use solar electricity, Bitcoin mining will be fine. And Elon Musk's electric car uses only an Electric engine.