Inside vast, 360-sided, 7000 cubic metre underwater cages off the coast of Panama, marine biologist Brian O'Hanlon is trying to solve some of the problems with large-scale aquaculture
The powerful antibacterial nanosilver can now be found in everything from air fresheners and food packaging to babies' bottles and bandages. But has anyone looked at the risks?
Developed countries still need to come forward with finance to help with adaptation and mitigation in less-industrialised countries hit hardest by climate change