1. (a) Water or ozone (or other CFCs)(b) Since 1750 the industrial revolution has taken place and the use of fossil fuels (which produce carbon dioxide when burned) for energy, industry and transport has increased hugely. As the population has increased emissions of methane have increased due to increased farming and the release of natural gas.(c) CFCs (used in aerosols and refrigerants and first made in the 1890s) and...