New York Times: Ecological Shifts Spell Challenges for the Pecos River Pecos River with rocky rapids flows from the mountains of northern New Mexico to the Rio Grande. Due to the harsh condition such as a distant river bluff, Pecos River was isolated from development for a long time. However, the ecological changes threaten Pecos River now. The water in the reservoir contains high level of salt. It makes agriculture in the region difficult since the river is unique source of water for agriculture. Besides, the salty condition gives optimized environment for a species of costal algae that is harm to freshwater fish. It began to be extended from the upper Pecos to other places and kill fish in the river. The state and some universities tried to prevent the extension of the algae and eliminate it. However, it was not successful. In the future, the change of the condition would be accelerated negatively. In the article, the change of the condition in Pecos River was covered. The power of nature is uncountable. Human can control some degree of natural change. However, the change of nature cannot be controlled. Human lives in nature that usually is helpful to human. In these days, the power of nature affects human being negatively after the arbitrary development. We should prevent the more destruction of nature.