While Tesla’s recent Investor Day might have lacked the punch some investors were hoping for, CEO Elon Musk did double down on the need for a sustainable energy economy and stressed that it doesn’t have to come at the expense of other necessities. “There is a clear path to a sustainable-energy Earth,” Musk said. “It doesn’t require destroying natural habitats. It doesn’t require us to be austere and stop using electricity and be in the cold or anything.” “In fact,” Musk went on to add, “you coul