1.   But not everyone was ready to jettison the hypothesis that manmade chemicals in the environment contribute to cancer.

2.   Other studies have also suggested that pesticides and other manmade chemicals may decrease sperm counts and otherwise affect human reproductive health.

3.   PCBs are manmade chemicals suspected of causing cancer in humans.

4.   Persistent organic pollutants are highly toxic manmade chemicals that include pesticides such as DDT, toxaphene, chlordane and industrial chemicals products like PCBs.

5.   Persistent organic pollutants are highly toxic manmade chemicals that include pesticides such as DDT, toxaphene, chlordane and industrial products such as PCBs.

6.   A more recent and disturbing impact of manmade chemicals upon the environment involves the chemical mimicking the sex hormones.

7.   It tends to occur over the Antarctic in winter as manmade chemicals become trapped in the upper atmosphere.

8.   Schoeberl said only one-sixth of the detected chlorine could come from natural sources, and all of the rest originates from manmade chemicals, such as CFCs.

9.   The manmade chemical kills by preventing oxygen from reaching vital organs.