Ref
[1] https://m.dw.com/en/tesla-changes-stance-on-bitcoin-amid-cli...
[2] https://www.nysfocus.com/2021/04/13/new-york-bitcoin-mining-...
[3] https://finance.yahoo.com/news/bitcoin-mining-pool-hashrates...
[4] https://medium.com/nanocurrency/fight-the-climate-crisis-use...
[5] https://www.cnbc.com/2021/04/08/chinas-bitcoin-mining-is-thr...
[6] https://www.reuters.com/technology/how-big-is-bitcoins-carbo...
[7] https://www.bloomberg.com/opinion/articles/2021-01-26/is-bit...