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(map) Peak summer "greenness"—a satellite measure of the amount and health of vegetation—was higher than average across the tundra in summer 2023, with especially high values (darkest green) in the North American Arctic. (graph) The peak "greenness" reached each summer in the tundra has increased over time in both NOAA and NASA satellite records. NOAA Climate.gov images, adapted from the 2023 Arctic Report Card and based on data provided by Matt Macander.