In the early days of paper production, the paper was made by hand and the process was very labor intensive. The paper was made by soaking rags in water and then pounding them into a pulp. The pulp was then placed on a screen and pressed to remove the water. The pulp was then dried and the paper was ready to be used. The first paper mill was built in England in 1495 and the first paper mill in the United States was built in 1690. Paper mills began to proliferate in the early 1800s as the demand for paper increased. The invention of the paper machine in 1803 by Nicholas-Louis Robert made paper production much faster and less labor intensive. The paper industry has changed a great deal since the early days of paper production. Today, paper is produced from wood pulp and other plant fibers. Paper mills use a variety of chemicals and processes to produce paper. The paper industry is a major contributor to air pollution and water pollution. Paper mills release a variety of pollutants into the air and water, including chlorine, dioxins, and furans. These pollutants can have serious health effects on humans and wildlife. The paper industry is also a major source of greenhouse gas emissions. Greenhouse gas emissions from paper mills come from the burning of fossil fuels, the production of chlorine, and the release of methane and other greenhouse gases from paper mills. The paper industry has a significant impact on the environment. Paper production is a major source of pollution and paper mills are a major source of greenhouse gas emissions.