1.   Although pollution may contribute by diminishing water quality, these near-shore dramas are something to behold.

2.   Although the researchers said that chemical pollution might have contributed to the mutations, they thought the more likely cause to be radiation.

3.   Shortages of water and arable land mounted, and unchecked industrial pollution contributed to an overall degradation of the environmental landscape.

4.   Some have found that water pollution has contributed directly to their demise by weakening their immune systems and making them more susceptible to illness.

5.   Air pollution contributes to lung disease, including respiratory tract infections, asthma and lung cancer.