This piece was originally published by High Country News and appears here as part of our Climate Desk collaboration. On a clear Saturday morning in July, I called the Saltwater Café in Point Roberts, Washington. The café is usually crowded with dozens of customers seated inside and out on the patio, taking in the view of the Gulf Islands across the Salish Sea and enjoying the salty breeze from the beach across the street. “On a normal weekend, you can’t get a seat,” said owner Tamra Hansen. But on the…