Brazil is back, president-elect Luiz Inácio Lula da Silva has told rapturous crowds at the UN climate summit COP27 in Egypt. Walking into a room of supporters singing his name, Lula promised to restore the Amazon rainforest and chase down climate criminals. Huge numbers gathered to see him speak, making him one of the superstars of this summit. Nations are meeting in Sharm el-Sheikh to discuss tackling climate change. Just …