One day, the environmentalist David De Rothschild was reading some information about all the plastic in the seas and oceans. He could't believe what he was reading. For example, humans throw away four out of every five plastic bottles they use and plastic rubbish causes about eighty per cent of the pollution in the sea. Soon afterward, Rothschild decided he wanted to help the fight against pollution in the sea. To create publicity for the problem, he started building a boat made of plastic bottles.