From cities and small islands threatened by rising seas, to regions facing extreme drought and deadly heatwaves, climate change threatens every part of the planet, the UN warned on Monday. Here are 10 key climate change threats and how they will hit various countries if emissions are not cut fast, according to the Intergovernmental Panel on Climate Change’s new report. – Heat: Sydney at 50C – Parts of the world will get too hot and humid for humans to live in this century if carbon emissions keep rising. Elsewhere, the heat will make it deadly to work outside for part of the year. In Africa, h…