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Practically all forms of technology exact a certain price in environmental damage; agriculture is no exception. Agriculture in turn is sometimes damaged by undesirable by-products of other technologies (see also pollution: The pollution of natural resources). Air has physical properties and a chemical composition that are vital parameters of life for both plants and animals. Temperature, water vapour, movement, oxygen, and carbon dioxide in the atmosphere have a direct effect on food and fibre production. Air quality is changed by introduction of contaminants into it, and agricultural activities using such air may be affected adversely. Damage to plants by air ...(100 of 17649 words)