Not all cryptocurrency are heavily based on CPU/GCU or I/O!!! As someone already posted, neo and nano currency are not based on "heavy" power usage. We could a

Not all cryptocurrency are heavily based on CPU/GCU or I/O!!! As someone already posted, neo and nano currency are not based on "heavy" power usage. We could argue what "heavy power usage" is but you can design cryptocurrency not to assume big amount of electricity. Imagine that bitcoin is 1st and worst cryptocurrency, but the technology can be improved and it's improving!