Agence France-Presse: The UN climate summit in Paris, which opens on November 30, is the latest bid to secure a universal climate rescue pact in a two-decade-long effort to limit global warming. Here are key markers in the gruelling process. - The world wakes up - 1988: The United Nations sponsors the creation of the Intergovernmental Panel on Climate Change (IPCC), and tasks it with gathering scientific data on climate change. 1990: The first IPCC report says that "greenhouse gases" generated by human activity are...