As the Spanish region of Catalonia battles its worst drought on record, activists are beginning to question Barcelona's mass tourism model. Should Spain's most visited city be allowed to welcome even more tourists this summer amid a state of emergency? The Down to Earth team takes a closer look.

Pumping industrial emissions into the depths of the Earth's crust – is it a silver bullet to pump the breaks on climate change? Norway says yes, as it prepares to launch the world’s first cross-border carbon storage facility. But will it cut global emissions? Or just greenwash and prolong the...