Instead of buying Crypto, and NFTs one should Invest In carbon offsets. Climate change isn't some future disaster. It is like 90% of the disasters that are happening year round with fires, storms, droughts, famines and disease. We need energy just to survive. I try not to feel guilty about energy consumption for the most part. If the grid was designed with sustainability in mind then it really wouldn't matter how much energy we consume.
Crypto coins are minted by crypto miners using computer hardware to perform difficult calculations. Due to the physics of computation it is not possible to do mathematical operations without consuming energy and producing heat. If there are many calculations then work must be done to pump the heat away from the processors, which consumes even more energy.
NFTs (non fungible tokens) are similar to cryptocurrency because both are based on block chain. The are useful to artist because the artist gets a cut of the transaction Everytime their work is bought and sold. Unfortunately the carbon footprint of this is an ecological disaster.
But if you want to invest sustainably there is a form of currency you can buy that has inherent value to the planet. If you pay the cost of carbon capture then you have established carbon credit. The idea is that you should be required to have carbon credit or carbon offset to balance your carbon footprint.