The Amazon rainforest, often called the lungs of our planet, is buckling under the pressure of rampant deforestation and climate change. Now, another threat is emerging, and scientists worry it could push this essential ecosystem over the edge.

It’s looking increasingly likely that this El Niño, which arrived in June, will become the strongest on record. The latest forecasts show sea surface temperatures in the equatorial Pacific Ocean peaking around 7.2 degrees Fahrenheit (4 degrees Celsius) in December, obliterating the previous record and supercharging global temperatures. El Niño alters weather patterns around the world, and in the…

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