In the midst of a heat wave in Nova Scotia, Canada, this July, humans sought out air conditioning and shelter in the shade. Fish in the Wrights River, meanwhile, converged on what patches of deeper, cooler water they could find, like holes in the streambed out of the sun’s glare. One of those areas of relief, though, hadn’t occurred naturally. It had been created by humans pumping cold water from a nearby well into the overheated stream. Cold-loving fish, like Atlantic salmon, flocked to this stretch of water in droves.

LINK (via Time)