two reasons:  1: entropy/change is the only constant in the universe  2: humanity has not existed in equilibrium with its environment for a very long time and human population has grown too much to a point where civilization must become so complex in order to sustain such a large population that the civilization's technology is no longer capable of efficiently or effectively providing for this population plus the technology and the civilization itself require an enormous amount of upkeep whose complexity continues to balloon  it's starting to look like humanity has failed the great civilizational filter and we're all just waiting for death now.
Canada