bill said on May 2, 2013 at 2:08 p.m. This is a great program and a great opportunity for students! The USA is blessed to have such great National Parks and the National Park Service! Thank goodness past leaders sought to preserve our nation's natural beauty. You can't find anything like them in most of the rest of the world. Kudos to this students for helping to preserve them!
Howard Cornell said on April 29, 2013 at 8:43 a.m. So the tamarisk trees threatened the current ecology of the Canyon. But: what if we killed whatever invasive newcomers threatened the status quos 25, 50, 100 or 200 years ago? Is it possible to predict what the ecosystem would consist of now? Would we "like" it? Maybe we cannot extrapolate as far as 200 years; but could we backtrack as far as we can and predict what effect this type of effort might have produced? I hope they would not have produced a forest of tamarisk trees!