In fact, the Mesozoic, when dinosaurs lived, had much higher CO2 than today, was much warmer than today, and is one of the interesting proof points for the effects of CO2 on climate.
事实上，在恐龙生活的中生代， 地球上有比现在多得多的二氧化碳， 也比现在温暖很多，这是二氧化碳对气候影响的 一个有趣的论据。