Berlin (dpa) — “Super crash,” “Crypto winter,” “Billions in value destroyed”: The current headlines on the cryptocurrency industry are spreading a bad mood among investors. But it’s not just the falling price of cryptocurrency that’s causing problems. In the face of looming climate catastrophe and general energy shortages, the huge amount of electricity needed to maintain the two main crypto systems of Bitcoin and Ether is being increasingly questioned by politicians and environmental activists. Now Ethereum, the blockchain that supports Ether, the second biggest cryptocurrency after Bitcoin, …