Humanity then progressed to the development of the printing press, the telephone, the computer, and then the Internet. While technological advances have helped economies develop and create the rise of a leisure class, many technological processes produce unwanted by-products, known as pollution, and the depletion of natural resources from the Earth's environment. As a consequence, philosophical debates have arisen over the use of technology and whether technology improves or worsens the human condition. Neo-Luddism, anarcho-primitivism, and similar reactionary movements criticize the pervasiveness of technology by stating that technology harms the environment and destroys human relationships.