General Antonio Guterres addresses the 77th Session of the United Nations General Assembly at UN Headquarters in New York City, US on September 20, 2022.— ReutersPARIS: The world is nowhere near ready for the “calamity” being caused by climate change and must urgently prepare for even worse in the future, UN Secretary General Antonio Guterres said on Thursday.Global efforts to adapt to climate change -- from building defensive sea walls to planting drought-resistant crops -- have not...