A nearly 3-decade-long study has revealed that rainfall has increased over tropical areas, and the majority of the highest-rainfall years have been since 2001. "When we look at the whole planet over almost three decades, the total amount of rain falling has changed very little. But in the tropics, where nearly two-thirds of all of Earth's rain falls, there has been an increase of 5 percent," said lead author Guojun Gu, a research scientist at Goddard Space Flight Center in Greenbelt, Maryland.

Researchers used satellites to monitor rainfall over oceans and combined the data with information from land-based rain gauges. When the land-based and space-based data are combined, ...

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