陽光、二氧化碳及水份充足情況下，光合作用在樹葉裡頭發生，二氧化碳的碳原子將儲存在樹木裡，並釋出氧氣。729Please respect copyright.ＰＥＮＡＮＡXwuvQQJusm
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秋天時份，溫度驟降，樹木意識到冬天即將來臨，便啟動落葉機制，以免冬天低溫為樹葉帶來傷害。729Please respect copyright.ＰＥＮＡＮＡgdAtWiCwZs
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（圖2）根據這個理念，全球氣侯所導致的溫度提升，將會使綠葉時間延長1-3星期。729Please respect copyright.ＰＥＮＡＮＡkUAHvWIsDt
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但出乎意外的是，實驗及現實證據指出，綠葉時間反而是平均縮短了3-6日（Ref1)。729Please respect copyright.ＰＥＮＡＮＡ89QUrjFudL
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（圖3）分析由1948-2015年達434,226項的樹木數據再加上各種實驗，科學家得出以下的解釋。729Please respect copyright.ＰＥＮＡＮＡfqSnqHgiMq
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全球變暖再加上大氣二氧化碳含量上升，樹木的光合代謝率亦因而有所提升。729Please respect copyright.ＰＥＮＡＮＡrJlsFyQllz
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光合代謝的過程中，二氧化碳的碳原子會以固體方式儲存在榭木內。729Please respect copyright.ＰＥＮＡＮＡvr3NVPaBiE
如果固體碳原子到達一定的程度，就算溫度和暖，亦會觸發樹葉變黃及落葉發生。729Please respect copyright.ＰＥＮＡＮＡ9U9uZWyFBX
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（圖4）圖中展示出兩種導致落葉情況發生的可能性。729Please respect copyright.ＰＥＮＡＮＡOxgTZw4Buv
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這表示出每一棵樹木均有其轉化二氧化碳至氧氣的限額，並不能夠無窮無盡地吸收二氧化碳。729Please respect copyright.ＰＥＮＡＮＡU2EWrNXGrC
單純依靠種植樹木意圖來改善全球的氣候變化，實際上亦有一定的限制。729Please respect copyright.ＰＥＮＡＮＡUhyaMwW2TV
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。729Please respect copyright.ＰＥＮＡＮＡVGBrziOuEN
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https://www.instagram.com/potatopigtongue/729Please respect copyright.ＰＥＮＡＮＡp6iqzGwd74
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Ref1:https://science.sciencemag.org/content/370/6520/1066?intcmp=trendmd-sci729Please respect copyright.ＰＥＮＡＮＡIKVzmdcU1C
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