他们知道往地下倾倒二氧化碳非常昂贵，并承担着破坏当地环境的风险。
They believe dumping carbon underground is expensive and risky for local environments.
从何时起，二氧化碳成了唯一影响地球环境的因子？
Since when has CO2 become the only factor of damaging the environment?
从何时起，二氧化碳成了唯一影响地球环境的因子？
Since when has CO2 become the only factor of damaging the environment?
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