If one person is at risk because of climate, then we are all at risk because of climate. Just in the last year pods of whales in Antarctica were so confused by the changes in the water and climate they didn't migrate. These whales are mammals. We are mammals. There is reason to protect existing species, because they are an indication of how seriously dangerous the oceans have become to sustain life.
Earth is a water planet. We will lose Earth if we continue down the current path.
