Our oceans are blighted with plastic waste. Globally, we're creating over 300 million tonnes of plastic every year, as it is a cheap and adaptable form of packaging. But its ease of use is coming at a cost we cannot afford to pay any longer - our seas and our sea life are being poisoned by plastic. In 2015, 322 million tonnes of plastic, enough to weigh the same as 900 Empire State Buildings, was produced.