A NASA scientist explains why the weather is becoming more extreme
A view of the Houston skyline after heavy rains broke during the aftermath of Hurricane Harvey August 29, 2017. Harvey, swirling for days off Texas and Louisiana, dumped more than 49 inches (124.5 centimeters) of rain on the region. | Photo credit should read BRENDAN SMIALOWSKI/AFP via Getty Images We're headed into uncharted territory'