What are the most environmentally friendly NFT cryptocurrencies?

Could you please elaborate on the most environmentally friendly NFT cryptocurrencies currently available in the market? Are there any specific blockchain platforms or consensus mechanisms that these NFTs utilize to minimize their carbon footprint? Additionally, how do these eco-friendly NFTs compare to their more energy-intensive counterparts in terms of energy consumption and sustainability? Are there any case studies or data available to support the claims of their environmental friendliness?