Graph showing monthly mean atmospheric carbon dioxide (CO2) levels at Mauna Loa Observatory, Hawaii, USA, since 1958. The levels are given in parts per million. This is the the longest record of direct measurements of carbon dioxide in the atmosphere. Levels of carbon dioxide have risen due to the combustion of fossil fuels and deforestation. The dashed red line with diamond symbols represents the monthly mean values, centered on the middle of each month. The black line with the square symbols represents the same, after correction for the average seasonal cycle.
| px | px | dpi | = | cm | x | cm | = | MB |
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TOP28015559
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達志影像
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RM
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