EnvironmentArt: Why Tomás Saraceno is floating on air Forget doomy "Anthropocene" ideas, if we're serious about saving Earth we need hope, says Tomás Saraceno, the artist whose tetrahedral balloons inspire researchers Culture
EnvironmentAcid is dribbling out of the melting permafrost in the Arctic As climate change thaws the Arctic permafrost, some of it is releasing sulphuric acid – which destroys limestone and releases even more climate-warming carbon dioxide 51¶¯Âþ