KUSA: Warm temperatures, colorful wildflowers. What's not to like, about early signs of spring? Climate scientists at NASA say these early signs could be tied to global warming, and the consequences are troubling. 9NEWS talked to NASA scientist Dr. Compton Tucker at the Goddard Space Flight Center in Maryland. He said that on average, the last frost of the year is happening about five days earlier than it did just five decades ago. Tucker said his conclusions are drawn from a fleet of Earth-observing...