 Canadian four-year-old Bilaal Rajan persuaded his parents to let him sell clementines to his neighbours door-to-door to raise money for earthquake victims in Gujarat. Thrilled by his success he organised other fundraising schemes in support of AIDS orphans and the victims of hurricanes and the Asian tsunami. Now aged 13, he has raised more than $5m, met Nelson Mandela and been appointed a UNICEF ambassador. He organises the Barefoot Challenge, an annual event for children around the world and advises young people on how they can work together in their local communities to increase awareness about global issues. |  Oceans are becoming the world’s rubbish dumps. It is estimated that every kilometre of ocean contains 74,000 pieces of plastic, forming a plastic soup of waste that kills hundreds of thousands of animals every year and leaches chemicals up the food chain. |