But Overpeck said what is clear is that it's not just a drought, but "a hot drought," which is more connected to man-made warming.
Studies: Wildfires worse due to global warming →
"We're losing the ability to monitor really key aspects of the climate problem from space," said Jonathan Overpeck, a climate scientist at the University of Arizona. "Just about every climate scientist in the world has got to be sad right now."
NASA research satellite plunges into the sea →