On it’s value as an investment:
Bitcoin is also not suitable as an investment. It does not generate cash flow (like real estate) or dividends (like equities), cannot be used productively (like commodities) or provide social benefits (like gold). The market valuation of Bitcoin is therefore based purely on speculation.
And the environmental impact:
the Bitcoin system is an unprecedented polluter. First, it consumes energy on the scale of entire economies. Bitcoin mining is estimated to consume electricity per year comparable to Austria. Second, it produces mountains of hardware waste. One Bitcoin transaction consumes hardware comparable to the hardware of two smartphones. The entire Bitcoin system generates as much e-waste as the entire Netherlands.
