This phenomenon is due to two factors: global warming results in longer growing seasons, and in an increase of carbon dioxide in the air.
In addition to jbenjami28’s response, research also points to an increased growing season of 7.8 days. Researchers think the increase in carbon dioxide in the environment is helping the trees “facilitate the processes of photosynthesis”. At the same time, the increase in temperature, as a result of global warming, is forcing the trees’ metabolisms to speed up. It’s important to note this study is reflective of forests in the East Coast’s ecosystem. Similar studies have yet to be performed on other ecosystems, so it isn’t yet known how extensive this change is.
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