Scientists from MIT, the National Oceanography Center in the U.K., and other institutions have discovered that the color of the ocean has undergone significant changes over the past 20 years. This global trend in ocean color is likely a result of human-induced climate change, according to a study published in Nature. By analyzing ocean color measurements taken by the Aqua satellite’s Moderate Resolution Imaging Spectroradiometer (MODIS), researchers found that these color shifts are not solely due to natural year-to-year variability. Rather, they have occurred over 56 percent of the Earth’s oceans, a larger area than all the land combined. In particular, tropical ocean regions near the equator have become increasingly green over time. These changes in ocean color reflect the altering ecosystems within the surface ocean, as the color is a direct reflection of the organisms and materials present. While the exact impact of these changes on marine ecosystems remains unclear, scientists are confident that human-induced climate change is the primary driver. The study’s findings provide further evidence of the wide-reaching effects of human activities on Earth’s biosphere.
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