Ever since the Industrial Revolution, air quality has been slowly developing into one of the world's most pressing issues. As pollution from industry, automobiles, and chemicals has increased, environmental advocates have become more vocal in their demands for legislation.

Although climate changes have occurred at times in the distant past, the rate at which climatic changes are taking place today seems to be increasing, causing concerns that the environment and population of humans and other animals will be adversely affected.

The conservation of our natural resources is a major issue for environmentalists today. Many natural resources—from fossil fuels to undeveloped lands—exist in finite supplies. The only way to ensure that they will still be available for future use is to protect them and to recycle as often as possible.

Price:	$28.75

Because fresh water is limited in supply, ensuring that water is safe for human use and consumption is a major concern. With the expansion of industry and the dumping of chemicals and other waste products, water sources have become smaller and more dangerous. Today, environmentalists struggle to make the public aware of how important it is to conserve and protect the water supply.

Environmentalists are committed to limiting the spread of the human population into wilderness areas, in the hope of preventing further losses of irreplaceable animals.