Final answer:
Biosphere 2 is useful today because it allows scientists to study the consequences of high CO2 levels.
Step-by-step explanation:
Biosphere 2 is useful today because it allows scientists to study the consequences of high CO2 levels. It is a large-scale experimental facility designed to mimic the Earth's ecosystems. Scientists can manipulate CO2 levels and observe the effects on plants, animals, and overall ecosystem health. The data collected from Biosphere 2 can help us understand and predict the impacts of increasing CO2 levels in the real world.
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