Aung Sun Suu Kyi to Bono, Rafael Nadal to Madonna - everyone seems to be doing their bit for nature. Take a look

Queen Elizabeth II of Britain is watched by gardener Norm Dunn (L) and her husband Prince Philip (R) as she plants a 'Black Sally' gum tree in the grounds of Government House in Canberra March 14, 2006. The tree, Eucalyptus stellulata, is called a 'Black Sally' for the English Weeping Willow or Weeping Sallow, and 'Black' because the bark of the tree is black. The Queen and her husband Prince Philip are in Australia on a five-day official visit which includes the opening of the Commonwealth Games in Melbourne.