Old English broc garment for the legs and trunk; see breeches). The sense might reflect the breeches sense, on the notion of two limbs or of appliances used in pairs. The typographical bracket is first recorded 1750, so called for its resemblance to double supports in carpentry (a sense attested from 1610s). Senses affected by Latin brachium arm..
Carbon dioxide, a greenhouse gas, is the main pollutant that is warming Earth. Though living things emit carbon dioxide when they breathe, carbon dioxide is widely considered to be a pollutant when associated with cars, planes, power plants, and other human activities that involve the burning of fossil fuels such as gasoline and natural gas.
A point source is a single, identifiable source of pollution (Wikipedia), such as a pipe or a drain. Industrial wastes are commonly discharged to rivers and the sea in this way.onpoint sources. Non-point sources of pollution are often termed âdiffuseâ pollution and refer to those inputs and impacts which occur over a wide area and are not easily attributed to a single source.