Brian Barton
Bitcoin, the world's biggest cryptocurrency, has been criticized for its negative impact on the environment. The process of mining bitcoin requires a lot of electricity, and as a result, can lead to increased carbon emissions and water pollution. However, recent data suggests that the geography of mining has changed, with miners moving to locations with cheaper and more renewable energy sources, which may improve bitcoin's carbon footprint. While the environmental impact of bitcoin mining is difficult to calculate exactly, it is estimated to use more electricity annually than entire countries, and produces thousands of tons of e-waste.
| Characteristics | Values |
|---|---|
| Energy consumption | The Bitcoin network generated about 10.52 kilotons (annualized) as of August 2024. The Cambridge Bitcoin Electricity Consumption (CBEC) Index estimates that Bitcoin uses an estimated 151 terawatt-hours (TWh) of electricity annually (0.59% of global electricity use). |
| Carbon emissions | It is hard to determine the carbon footprint of Bitcoin mining. However, one source estimates that the Greenidge Generation power plant's greenhouse gas emissions increased almost tenfold between 2019 and 2020 due to Bitcoin mining. |
| Water usage | Large-scale Bitcoin mining farms have discharged hot or warm water into lakes or other bodies of water, raising concerns about contamination and rising temperatures. |
| E-waste | Bitcoin mining produces thousands of tons of e-waste per year. |
| Locations | The United States is the largest country for Bitcoin mining, accounting for more than one-third of Bitcoin mining activities. Other locations include Venezuela, Kazakhstan, and China (before the crypto ban). |
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What You'll Learn
Bitcoin mining's energy consumption
Bitcoin mining is an energy-intensive process that involves solving complex mathematical problems to validate transactions and add them to the blockchain. The process requires a significant amount of computational power, which in turn requires a substantial amount of electricity. The decentralised nature of Bitcoin mining means that multiple miners compete to solve these problems, leading to higher energy consumption. As more miners join the network and the difficulty of the problems increases, Bitcoin's energy consumption also increases.
The energy used for Bitcoin mining is primarily sourced from fossil fuels, with coal being a significant source. According to the Bitcoin Energy Consumption Index, the carbon footprint of Bitcoin mining has been increasing. The average carbon intensity of electricity consumed by the Bitcoin network increased from 478.27 gCO2/kWh in 2020 to 557.76 gCO2/kWh in August 2021. This is due in part to the mining crackdown in China during the Spring of 2021, which resulted in miners moving to countries like the US and Kazakhstan, where coal- and gas-based electricity are predominantly used.
The energy consumption of Bitcoin mining is a pressing issue, with annual estimates ranging from 91 to 150 terawatt-hours, and even reaching 390 terawatt-hours according to some sources. This is comparable to the annual energy consumption of entire countries. For example, the Bitcoin network consumes more electricity than Chile, and the 34 largest Bitcoin mines in the US consumed 33% more electricity than the city of Los Angeles during the study period.
However, there are efforts to reduce the carbon footprint of Bitcoin mining. According to some estimates, almost 50% of Bitcoin mining uses renewable energy sources, such as hydropower, wind, nuclear/non-renewable, and solar power. Additionally, more energy-efficient algorithms like proof-of-stake are being developed, which could potentially reduce energy consumption by 99.85% compared to the current proof-of-work system.
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Bitcoin's carbon emissions
The exact amount of energy used for bitcoin mining is hard to calculate, but estimates place it at around 151 terawatt-hours (TWh) annually, according to the Cambridge Bitcoin Electricity Consumption (CBEC) Index. This is more than the entire country of Ukraine consumes in a year. Other estimates place the figure lower, at around 98 terawatt-hours. This still equates to around 435.61 kilowatt-hours of electricity per transaction, as much power as the average American household consumes in 15 days.
The high energy consumption of bitcoin mining has led to concerns about its carbon emissions and contribution to climate change. A non-peer-reviewed study by the Cambridge Centre for Alternative Finance (CCAF) estimated that bitcoin mining resulted in annual greenhouse gas emissions of 39.8 Mt CO2 in 2025, representing 0.08% of global emissions. Another estimate, by the United Nations University, found that bitcoin mining emitted over 85.89 Mt of CO2 during the 2020-2021 period. This is a substantial carbon footprint, and the UN study concluded that the greenhouse gas emissions from bitcoin mining could push global warming beyond the Paris Agreement's goal of keeping anthropogenic climate warming below 2 degrees Celsius.
The majority of bitcoin mining takes place in China, the United States, and several other nations. These mining operations are often located in places where electricity is cheap or subsidised, which can drive up energy costs for local communities, as seen in Plattsburgh, New York. The primary energy source for bitcoin mining is coal, a fossil fuel that produces significant carbon emissions.
However, there are potential ways to mitigate bitcoin's carbon emissions. Some studies have suggested that using surplus electricity from renewable energy sources, such as wind and solar power, for bitcoin mining could reduce electricity waste, balance the electrical grid, and accelerate the transition to sustainable energy. Additionally, pairing bitcoin mining with green hydrogen infrastructure can support the deployment of solar and wind power capacities.
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Bitcoin mining's water usage
Bitcoin mining has a significant impact on water resources, with a water footprint that is growing as the price of Bitcoin rises.
Bitcoin mines are large data centres that require a lot of electricity and water to function. The water consumption associated with a single Bitcoin transaction could fill a small backyard pool. The water footprint of Bitcoin mining is estimated to have reached 1.65 cubic kilometres of water in 2020-2021, which is enough to fill over 660,000 Olympic-sized swimming pools and exceeds the domestic water use of over 300 million people in rural Sub-Saharan Africa. China, the USA, and Canada had the largest water footprints during this period.
The high energy consumption of Bitcoin mining also has indirect effects on water resources. Power plants use water in their cooling systems, so the large amount of electricity required for Bitcoin mining contributes to water consumption in power generation.
The environmental impact of Bitcoin mining is a growing concern, with rising demand leading to increased mining activity and associated water usage. The profitability of Bitcoin mining is influenced by energy prices, with cheaper electricity incentivising more mining. As a result, countries with low electricity prices, such as Kazakhstan, have become hubs for Bitcoin mining, despite facing water shortages.
To address the environmental impacts of Bitcoin mining, there have been calls for policy interventions and the development of more sustainable technologies. Some crypto mines are adopting alternative cooling systems that use non-conductive liquids instead of water, which can significantly reduce water consumption.
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Bitcoin's e-waste
Bitcoin mining is done with specialised hardware that becomes obsolete approximately every 1.5 years. This means that older, less efficient models are replaced by newer ones and are not recycled or reused, leading to large amounts of electronic waste (e-waste).
As of May 2021, researchers estimated that the entire Bitcoin network generated 30.7 metric kilotons of e-waste per year from Application-Specific Integrated Circuit (ASIC) hardware that became unprofitable and obsolete. This is comparable to the small IT equipment waste produced by a country like the Netherlands. At peak Bitcoin price levels seen in early 2021, the annual amount of e-waste may grow beyond 64.4 metric kilotons.
The competitive nature of Bitcoin mining and tight profit margins incentivise the development of more powerful mining equipment. This pursuit of faster, more powerful hardware contributes to the generation of e-waste, as old equipment is discarded and not reused. The Bitcoin halving, a process meant to control Bitcoin's inflation rate and limit the total lifetime supply of Bitcoin, further incentivises the use of newer, faster mining equipment to maintain profitability.
The Bitcoin E-waste Monitor was created to provide insight into the amount of e-waste generated by the Bitcoin network. The enormous amount of e-waste generated by Bitcoin, in addition to its energy consumption, showcases why renewable energy alone cannot solve Bitcoin's sustainability problem. Globally, only 20% of all electronic waste is recycled, with the rest ending up in environmentally damaging landfills. Therefore, it is essential to address the issue of e-waste in the Bitcoin industry and explore alternatives to reduce the incentive for specialised mining equipment and the need for large amounts of energy.
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Bitcoin's impact on the environment
Bitcoin, the world's biggest cryptocurrency, has been criticised for its negative impact on the environment. The process of mining bitcoin requires a lot of electricity, which often comes from burning fossil fuels. This releases large amounts of carbon emissions and contributes to climate change. Bitcoin mining also produces electronic waste and has been linked to water pollution.
Bitcoin mining is a process that involves solving complex puzzles with specialised computers, known as mining rigs. These computers require a lot of electricity to operate, and the energy consumption increases as more miners join the network. The more computing power a miner has, the higher their chances of receiving rewards. As a result, miners have been flooding the network with energy-hungry machines, leading to a significant increase in energy consumption.
The exact amount of electricity consumed by bitcoin mining is difficult to determine, but estimates range from 98 to 151 terawatt-hours annually. This is more electricity than is used by some small countries and even large nations like Ukraine. The energy consumption of bitcoin mining is also greater than that of major tech companies like Google, Apple, Facebook, and Microsoft combined.
The environmental impact of bitcoin mining has been a growing concern. In the United States, which is home to about seven per cent of the world's bitcoin mining, the city of Plattsburgh, New York, experienced a dramatic increase in electricity costs due to bitcoin mining operations. Old power plants in New York State are being converted to provide electricity specifically for mining farms, leading to increased greenhouse gas emissions. However, some miners are turning to renewable energy sources, such as wind power in Texas and nuclear power in Florida.
Initiatives like the Crypto Climate Accord aim to address the environmental impact of bitcoin and other cryptocurrencies. The Crypto Climate Accord's goal is to make blockchains run on 100 percent renewable energy by 2025 and achieve net-zero emissions for the entire cryptocurrency industry by 2040. Ethereum, the second-largest cryptocurrency network, is also taking steps to reduce its energy consumption by transitioning to an alternative validation system. While bitcoin mining may not be as harmful to the environment as it once was, the push towards renewable energy sources and more efficient validation methods is crucial for mitigating its impact on the planet.
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Frequently asked questions
It's hard to know the exact amount of energy used for Bitcoin mining, but estimates place the figure at around 151 terawatt-hours (TWh) of electricity annually, more than Ukraine's energy consumption in 2022.
Bitcoin mining requires a lot of electricity, often generated by burning fossil fuels, which releases carbon emissions and contributes to climate change.
Bitcoin mining has been linked to increased greenhouse gas emissions, water pollution, and e-waste production. It also fosters a greater dependency on fossil fuels and can disrupt local electricity markets.
Yes, initiatives like the Crypto Climate Accord aim for blockchains to run on 100% renewable energy by 2025 and achieve net-zero emissions by 2040. Some cryptocurrencies are transitioning to alternative validation systems that require less computational power.
