LiveScience: With billions of overlapping leaves, stretching sometimes for hundreds of feet above the ground, the canopies of the world’s rainforests act like giant umbrellas – catching rain before it has a chance to reach the forest floor. It turns out that these arboreal umbrellas intercept almost 2 trillion gallons of rain each year, a new study that could improve our understanding of the impacts of climate change finds. That’s about 20 percent of the rain that falls from the sky over the …