The Great Bubble Barrier is just that – a wall of bubbles. It gurgles across the water in a diagonal screen, pushing plastic to one side while allowing fish and other wildlife to pass unharmed. TerraCycle’s river traps, which are installed in some of Bangkok’s 1,600 polluted canals, catch up to 2.5 tonnes of waste a day, helping to recycle plastic instead of sending it to landfill.