Bright perky young people, far more intelligent than adults, gathered in their thousands on Hove Lawns and across the globe today, to demand action from world leaders over the climate emergency. Business-as-usual greenhouse emissions will mean these young people will reach old age in a world on average between 4 °C - 5 °C hotter than 1850 levels. Since this is a projected average, many landmasses away from coastlines will be experience higher temperatures . Parts of Africa will become uninhabitable. The climate of southern Europe will be more like north Africa today. The Amazon rainforest is expected become a dusty savannah. Rising sea levels will inundate Pacific islands. Scientists expect the arctic to be ice free in summer between 2030 and 2050, while droughts, wildfires and floods are set to ravage North America, Europe and Australia. It is feared that methane gas from melting tundra will drive positive feedback loops, hindering our ability to control dangerous global heating.