Contributes to 'greenhouse effect'. Power stations Denature the enzymes of aquatic organisms. Vehicle exhausts Reacts reversibly but strongly with haemoglobin, and so reduces the availability of dioxygen to aerobically respiring cells. Households Factories Cause 'foaming', and so prevents the diffusion of gases essential to aquatic organisms. Contribute to soil erosion.
Nitrates are soluble, so maybe present in water supply.
Agriculture Forestry Human habitats Accumulate up trophic levels. Can cause mutations. Are not always selective to pests, which usually evolve resistance rapidly. Contribute to photochemical smog. The 'greenhouse effect' is caused by certain gases in the atmosphere trapping heat radiated from the Earth.