2. Advertising spending worldwide n

2. Advertising spending worldwide now exceeds $350 billion per year. In the United States alone about 6,000 advertising agencies help create and place advertisements in a variety of media, including newspapers, television, direct mail, radio, magazines, the Internet, and outdoor signs. Advertising is so commonplace in the United States that an average person may encounter from 500 to 1,000 advertisements in a single day, according to some estimates.
3. Human population growth is at the root of virtually all of the world’s environmental problems. Although the growth rate of the world’s population has slowed slightly since the 1990s, the world’s population increases by about 77 million human beings each year. As the number of people increases, crowding generates pollution, destroys more habitats, and uses up additional natural resources.