SIERRA CLUB — WARMING LAKES WORLDWIDE COULD MEAN MORE TOXIC ALGAL BLOOMS — PLANET EARTH IN BLACK AND WHITE group

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Contest — Reflections on Water

A new study of algal bloom activity in dozens of freshwater lakes around the world provides an answer: For the past 30 years, lakes nearly everywhere have been experiencing more frequent and severe toxic algal blooms—and a changing climate is one reason why.

Researchers at the Carnegie Institution for Science used satellite data collected over the past three decades to examine large freshwater lakes across six continents. They searched through more than 72 billion data points to identify statistically significant patterns in algal bloom intensity and found that the severity of algal blooms has increased in over two-thirds of the 71 large lakes studied across 33 countries

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