Climate Change is the increasing average annual global temperature and is caused by the build-up of unnatural amounts of greenhouse gases (GHG), like carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and chlorofluorocarbons (CFC). Dimension #2 Climate Change, Earth Science, Marine Ecosystem, Carbon Dioxide, Carbon Cycle, Methane, Global Warming, Greenhouse Gases, Oceans