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太阳照射在地面上一天的能量相当于全世界一年耗能量(包括食物)的70倍左右,太阳作为能量的来源是极其丰富的.地球上CO_2浓度在一些地质年代减退过以后,现在又以每年递增3%的速度上升.1979年联合国世界气候会议估计,CO_2的含量在二十一世纪中叶可能增加一倍,二十一世纪末可能增加四倍.CO_2的来源也是取之不尽,用之不竭的.全世界每年光合固碳量约2×10~(11)吨(为1970年世界耗能量的10倍),在这些有机物中有6%可直接或间接地作为人类的食物,养活
The sun’s energy as a source of energy is extremely rich in the day when the sun shines on the ground for a day equal to about 70 times the annual energy consumption (including food) in the world.With the decline in some earth’s geologic age, An annual increase of 3% .According to the United Nations World Climate Conference in 1979 estimated CO 2 content in the middle of the twenty-first century may double, by the end of the twenty-first Century may increase fourfold .CO_2 source is inexhaustible, with Inexhaustible.The total amount of photosynthetic carbon sequestration in the world is about 2 × 10 ~ (11) tons per year (10 times of the world’s energy consumption in 1970), and 6% of these organic compounds can be fed directly or indirectly as human food