| http://www.w3.org/ns/prov#value | - Climate ChangeThe Intergovernmental Panel on Climate Change (IPCC) in its Fourth Assessment Report (AR4), the most recent, states that global atmospheric concentrations of greenhouse gases such as carbon dioxide, methane and nitrous oxide have increased markedly as a result of human activities since 1750, and that most of the observed increase in global average temperatures since the mid-20th cent
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