Maybe you entered your private key on the phishing site. Or installed infected extension in your browser. Or just your computer is infected with keylogger or something like that. But MEW is not a scam.

IMHO bank services are using much more electricity. Anyway some countries even now receive huge % of electricity from nature sources (sun, wind etc) and with time this percent will even increase

Buy top-20 or top-50 cryptocurrencies, they will give stable high profit

Is you`ll download all blockchains for your coins, it would be the safest choice for you  

INS Ecosystem looks good, they want to sell groceries directly to customers.Good idea and strong team.