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www.cnn.com/2020/11/27/europe/fall-leaves-intl-scli-climate-...
Every year, in a process known as senescence, the leaves of deciduous trees turn yellow, orange and red as they suspend growth and extract nutrients from foliage, before falling from the tree ahead of winter....Global warming has resulted in longer growing seasons -- spring leaves are emerging in European trees about two weeks earlier, compared with 100 years ago, researchers said.

"Previous models assumed that because autumns will get warmer and warmer over the coming century, autumn will get delayed -- growing seasons will overall get longer, and autumn will get delayed by two to three weeks," ecosystem ecologist Constantin Zohner said.
However, Zohner and a team of researchers have said their findings reverse this prediction. "We actually predict by the end of the century, leaves might even fall off three to six days earlier," Zohner, a corresponding author on the paper published Friday in the journal Science, added....

Increases in spring and summer productivity that come as a result of elevated carbon dioxide, temperature and light levels actually drive trees to lose their leaves earlier, the experts found. It had been assumed, Zohner said, that fall temperatures and day length were the main environmental factors that cause trees to lose their leaves. Now, researchers have identified a third factor -- a "self-constraining" productivity.

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