Crypto exchanges usually combine a function of an exchange and a clearing house. And tend to create ad-hock financial instruments. Hence the risk. To me i

Crypto exchanges usually combine a function of an exchange and a clearing house. And tend to create ad-hock financial instruments. Hence the risk. To me it feels like it is time to rethink at least the proof-of-work coins, particularly the CO2 emissions and energy use. It is crazy that people go cold in Europe while the energy is spent to mine bitcoins. And that the amount of CO2 produced by mining bitcoins is that of a small country. While the benefits of of all these coins seem to be nonexistent.