Damaged Amazon Adds to Global Warming / Belo Monte Dam Disrupts Amazon Floodplain Balance / Horse of a Different Color / Beyond the Headlines / Prehistoric Magnetic Flip Shook Up Life on Earth / Not Just Maple Syrup: Birch, Beech and Other Sappy Trees The first broad study of all greenhouse gases in the Amazon rainforest reveals that the damaged ecosystem is now a net contributor to climate change, due mostly to warming and other human activities like logging, dam-building, and cattle ranching. Also, Earth's magnetic poles wander around and flip every now and then, and now scientists have evidence for how these flips impact life on Earth. Linking a magnetic pole reversal about 41,000 years ago to megafauna extinctions, climatic changes, and even a rise in ancient cave art. And it's maple syrup season, but these aren't the only sappy trees that can be tapped to make syrup. A trip to a syrup producer in New Hampshire to taste syrups made from birch, beech, walnut, and other trees. Learn more about your ad choices. Visit megaphone.fm/adchoices