Some 1,000 Penguin staffers worldwide are set to do the Penguin Walk for the second time for the annual World Environment Day on 5th June.

The sponsored walk will raise funds for the United Nations Environmental Programme's 'Plant a Billion Trees' project.

In London, around 500 walkers will tackle up to half a marathon through the London Parks. Meanwhile there will also be walks by staff from Penguin's international offices, including those in Delhi, Johannesburg, New York and Beijing, where walkers will tackle the Great Wall of China.