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Blockchain’s energy use is a hot topic. Proof‑of‑Work chains consume massive electricity, driving carbon footprints. Yet the industry is pivoting: Proof‑of‑Stake, sharding, and layer‑2 roll‑ups cut consumption by 99%. Green mining farms, renewable‑powered nodes, and carbon‑offsets add a hopeful twist. The future is cleaner, but vigilance is key.