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Scientists suspected the 2015-16 El Nino was responsible for the largest annual increases in atmospheric carbon dioxide concentration seen in at least 2,000 years, but exactly how has been a subject of ongoing research. Analyzing the first 28 months of data from NASA's Orbiting Carbon Observatory-2 (OCO-2) satellite, researchers conclude impacts of El Nino-related heat and drought occurring in tropical regions of South America, Africa and Indonesia were responsible for the record spike in global carbon dioxide. [Source: NASA]
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