Marine pollution is a big problem. More than eight million tonnes of plastic enters the oceans each year, equal to dumping a garbage truck of plastic every minute, a 2015 report published in Science found. And according to WWF, 80 per cent of plastics in our oceans are generated by land-based activities. Plastic rubbish is a direct threat to our marine animals and plants. Often, wildlife will mistake plastics for food and swallow it; once digested, these plastics can block breathing passages and stomachs, leading to a painful death.