1.   According to the U.S. Agriculture Department, trees reduce air and water pollution, heat us in the winter, cool us in the summer and increase property value.

2.   Rubin also praised laws and programs that have helped reduce air and water pollution.

3.   The complex debate, mixing an inter-industry squabble with concerns about both air and water pollution, typifies the tough trade-off decisions that often confront environmental policy-makers.

4.   When asked what environmental problem was most important, people were more likely to name air and water pollution than global warming.