International aid agencies and environmental groups have hailed Pope Francis’s “game-changing” message on the need to protect the environment and tackle climate change. Photograph: Maurizio Brambatti.

Ireland’s Catholic primate Eamon Martin and former president Mary Robinson are among many who have extended an enthusiastic welcome to Pope Francis’s (...)

The main greenhouse gas blamed for global warming averaged 400.03 parts per million at a monitoring station on Hawaii’s Mauna Loa volcano yesterday. Image NOAA

The concentration of carbon dioxide in the atmosphere surpassed 400 parts per million for the first time since measurements began, breaching a (...)