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========== [MUSIC] July 2016 was the hottest July ever recorded. Same with June. And also May. April, though… April was also the hottest April. In fact, every month going back to October
2015 has been the hottest since 1880. Cue the Nelly. It’s hard to argue Earth isn’t heating
up. Because… unless you have a neck problem…
it IS. But what’s REALLY warming the Earth? The climate’s a complex system, influenced
by everything from our orbit to gases in our atmosphere to volcanoes. And when we say warmer… warmer compared
to WHAT? For most of history, temperature records looked
something like this… “Hot today. Hotter‘n’yesterday. Gonna be hot tomorrow.” But with the development of accurate thermometers
and standardized temperature scales in the 1700s, we could finally get s...