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01 December 201923.00 Two recent emergencies, that of the burning Amazon rainforest and that of Venice under water, are the backdrop for the 25th UN Conference on climate change that opens in Madrid. Until December 13, the Sherpas first and the ministers of the Environment of the 196 participating countries (197 with the EU) then have to face several key questions. First of all, to increase the efforts to reduce greenhouse gases that are the cause of global warming and extreme climatic phenomena.