Rainwater harvesting grows in the Southwest and beyond to nourish thirsty gardens in a hotter world

The tall 58-year-old jumped like a kid in the puddles on the sidewalk one recent August afternoon after a half inch (1.3 centimeters) of rain suddenly fell in Tucson, Arizona, during an especially dry summer. “Sweet!” Lancaster exclaimed, beaming when he saw how the water pooled in a basin he had d...

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