Hurricane Maria unleashes devastation in Puerto Rico; 3.4 million without power

The Category 4 hurricane with sustained wind speed of 250 km/h snapped power lines, uprooted trees and brought 50 cm of rainfall

Hurricanes are now getting intense more quickly than 30 years ago

Rapid intensification occurs when the maximum wind speed in a hurricane goes up by at least 28.8 miles within a 24-hour period