This summer has seen nations across the world battle wildfires and extreme temperatures. It now has the dubious honor of being the world’s hottest summer on record, according to the latest European Union data. This comes just as the first-ever African climate summit comes to close. Hosted by Kenya and the African Union, the event called for the establishment of a global carbon tax system. Damilola Ogunbiyi is the co-chair of UN Energy and joins the show from the summit in Nairobi. Also on today's show: Richard Haass, President Emeritus, Council on Foreign Relations; Bobby Ghosh, Columnist, Bloomberg / Former Editor in Chief, Hindustan Times; author/activist Baratunde Thurston, host of PBS' "America Outdoors" To learn more about how CNN protects listener privacy, visit cnn.com/privacy