The National Park Service is facing a water conundrum: some parks have too little, some parks have too much. While an historic drought continues to parch much of the Western United States, a new report from the National Oceanic and Atmospheric Association predicts that sea levels across the United States will rise, on average, 10-12 inches by 2050. In other words, from Maine to Florida to Texas and all the way up to Alaska, there are more than 100 national park units threatened by the slow siege of rising coastlines.