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Why This Giant Bag of CO2 is Actually Useful

10 insights saved from this video by @science

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Iron-air batteries release energy as iron rusts, then use electricity to turn that rust back into iron.
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Energy Vault’s 33-story facility in Rudong, China lifts and lowers 24-metric-ton bricks made from dirt, water, and polymer.
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Iron-air batteries can discharge for up to 100 hours, returning approximately 50–60% of the energy used to charge them.
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Compressed-CO2 batteries liquefy carbon dioxide under pressure, then evaporate it through turbines to regenerate electricity.
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Energy Dome’s Sardinia installation stores roughly 2,000–2,200 tons of carbon dioxide inside an inflatable system.
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Gravity batteries lift heavy objects when electricity is plentiful, then lower them to drive generators when power is needed.
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Most lithium-ion grid batteries last only four to eight hours, leaving cloudy periods and windless weeks uncovered.
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Grid-scale energy storage can use water, gravity, iron oxidation, and compressed carbon dioxide, not just conventional batteries.
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Pumped-storage hydropower pumps water uphill, then sends it through turbines downhill to turn stored gravity into electricity.
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Pumped-storage hydropower demands expensive construction, suitable terrain, and large reservoirs that must be maintained.

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