Last year was by far the warmest year on record globally. National Oceanic and Atmospheric Administration (NOAA), the National Aeronautics and Space Administration (NASA), and European datasets all confirm the numbers. That means the 10 warmest years on record globally are the past 10 years. How do climate scientists explain this unprecedented warming trend? Jared Rennie is a research scientist with NOAA's National Centers for Environmental Information and he discussed what we should take away from the numbers.