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Confronting the Carbon-Footprint Challenge of Blockchain
Xiaoyang Shi1,2, Hang Xiao2, Weifeng Liu3
1Lenfest Center for Sustainable Energy, Department of Earth and Environmental Engineering, Columbia University, New York, New York10027, United States.
Environmental Science & Technology
|January 6, 2023
Summary
Proof-of-Stake (PoS) offers a sustainable alternative to energy-intensive Proof-of-Work (PoW) in blockchain. Transitioning to PoS can drastically cut blockchain
Area of Science:
- Blockchain Technology
- Environmental Science
- Computer Science
Background:
- Blockchain networks rely on consensus mechanisms like Proof-of-Work (PoW).
- PoW-based blockchains, such as Bitcoin and Ethereum, consume substantial electricity.
- This high energy consumption contributes to a significant carbon footprint.
Purpose of the Study:
- To analyze and compare the energy consumption and carbon footprint of PoW and Proof-of-Stake (PoS) consensus mechanisms.
- To project the environmental impact of Bitcoin and Ethereum under current and alternative consensus models.
- To highlight the potential of PoS to mitigate the sustainability challenges in blockchain technology.
Main Methods:
- Comprehensive elucidation of current and projected energy consumption data for PoW and PoS.
- Modeling energy consumption for PoS-based Ethereum to predict other PoS systems.
- Carbon footprint analysis based on energy consumption metrics.
Main Results:
- PoW-based Bitcoin and Ethereum could drive global temperatures above 1.5 °C if current trends continue.
- Proof-of-Stake (PoS) can reduce blockchain carbon footprints by up to 99% compared to PoW.
- PoS-based blockchains present a viable, low-carbon solution for future adoption.
Conclusions:
- The current PoW consensus mechanism poses a significant sustainability problem for blockchain.
- Urgent development and adoption of PoS are crucial to address blockchain's environmental impact.
- PoS can make blockchain technology environmentally attractive in a carbon-constrained future.
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