The Peruvian environment minister Manuel Pulgar-Vidal delivering a speech during the opening of the  20th United Nations Climate Change Conference at Lima, Peru, this month. Photograph: Paolo Aguilar

Frantic negotiations to salvage the UN’s 20th climate conference are running right up to the wire after an earnest plea to negotiators by its presi(...)

International government officials participating in the UN climate convention in Bonn, Germany. Photograph: EPA/Matthias Balk

Messages of hope about how major cities, regions and even some countries are forging ahead in the battle against global warming were delivered here y(...)