This story was originally published in Undark and appears here as part of the Climate Desk collaboration. On a windy morning in March, two older surfers at LeCount Hollow Beach, on Cape Cod, look out at the gray Atlantic. They are scanning the water closest to shore for seals, with whom they increasingly have to share the frigid water, which can dip as low as 37 degrees Fahrenheit in winter. The seals are a growing demographic. They have been rebounding since the 1970s, after almost being hunted to extinction. They…