Esme Stallard,Climate and science reporter, BBC News and Matt McGrath,Environment correspondent, BBC NewsPablo Porciuncula/AFPBrazilian President Lula warned of "extremist forces" when he addressed world leaders at the global climate ...

Helen CattPolitical correspondentGetty ImagesWhen the UK became the first major economy in the world to commit to reducing its carbon emissions to net zero by 2050, there was so ...