Can small land areas actually influence the composition of the atmosphere on the planet |

Each year in the Northern Hemisphere, levels of atmospheric carbon dioxide (CO2) drop in the summer as plants inhale, and then climb again as they exhale and decompose after their growing season. Over the past 50 years, the size of this seasonal swing has increased by as much as half, for reasons that aren’t fully understood.

“The fact that such a small land area can actually affect the composition of the atmosphere is an amazing fingerprint of human activity on the planet.”

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