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Cryptocurrency
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Letters | As Hong Kong embraces Web3, let’s pay attention to bitcoin’s sustainability

  • Readers discuss how to turn bitcoin mining into a green industry, the baby-unfriendly environment in Hong Kong, and the eco-friendliness of designated garbage bags

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Bitcoin ATMs in Hong Kong in 2022. Photo: Bloomberg
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During the 2008 financial crisis, bitcoin emerged, offering a decentralised alternative to traditional financial systems. Bitcoin’s algorithm-driven trust mechanism has fostered an ecosystem that integrates bitcoin generation, distribution and trading.

However, bitcoin mining has been criticised for its high energy consumption, posing significant environmental, social and governance (ESG) challenges. As of August, bitcoin’s energy consumption per year was around 141.75 terawatt-hours, equivalent to over 40 per cent of the United Kingdom’s annual electricity demand (around 321TWh) last year.
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Therefore, the question arises: can bitcoin mining contribute to a sustainable world? We believe that it can, by becoming a green industry through three key methods.

First, the bitcoin mining industry can optimise energy usage. Sourcing green energy for mining activities can reduce emissions, enhance renewable energy industry efficiency and create economies of scale. According to Cambridge University’s estimates, Bitcoin’s actual greenhouse gas emissions are just 0.14 per cent of global emissions.
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Some bitcoin miners already use energy mixes including varying levels of sustainable energy and migrate seasonally to use renewable energy efficiently.

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