The extremely cold weather last winter clearly had much to do with it, but pollution and other factors may have contributed.

Scientists suspect that pollution may be contributing to declines in the population of native fish species.

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

The lake was also the source of the city's drinking water, and the pollution contributed to a major typhoid outbreak.

Over use of styling products (especially during the party season),grime and pollution all contribute to making the hair look dull.

Meanwhile, pollution and allergies contribute to increase in cases.

In search of further proof that "light pollution" contributes to human cancer, circadian researchers are studying blind women.

Besides the urban and industrial pollution, agricultural pollution also contributes greatly to the environment's contamination.

Road maintenance practices, herbicides, and pollution may have contributed to the rarity of the plant.

He said a combination of greater awareness, improved diagnosis and increased pollution may be contributing to the increase in the rate.