In early June, Investing.com polled 1,103 investors about the environmental impact of Bitcoin mining. About a third of those polled indicated they only learned about Bitcoin's environmental impact after Elon Musk slammed the coin's carbon footprint on Twitter. After Tesla announced that it had purchased $1.5 billion in Bitcoin in February, Musk helped the coin reach new highs, and it continued to climb until April, when it reached its all-time high of $62,000.