Same reason why our core is solid at the center and liquid outside of that. High pressures tend to turn elements and molecules into solid/liquid states.
CO2 sequestration has many issues right now and it is doubted whether it will ever be a realistic alternative. However, much research on it is being done right now. There have been many times when a streak of innovations have changed what we view as "realistic".
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I like my perspectives like I like my baseball caps: one size fits all.
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