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Climate Change treaty signed by more than 165 countries at the UN in New York, but will it be ratified?; President Santos of Colombia calls for the legalisation of drugs; Owen Bennett Jones on combating the Zika virus in Texas Photo shows John Kerry, the US Secretary of State, carrying his granddaughter Isabelle Dobbs-Higginson, 2, after signing the Paris Agreement on climate change at the United Nations Headquarters in New York. Photo credit: European Photopress Agency