Competition: win one of five copies of Tim Flannery's Here on Earth, worth £14.99

THIS COMPETITION IS NOW CLOSED

All you have to do* is:

1. Complete the form to the right
2. Answer the question correctly

You will then be entered in to a draw to win one of four OWL Pink Micro electricity monitors.

Entries will be accepted until Noon (GMT) on 22nd March, 2011 and winners will be emailed on the same day. Please note that if we have not heard from you within 3 weeks of the closing date, we will draw another winner.

TERMS AND CONDITIONS

Please note we will only contact you if you are a winner.

Your details will only be used for the purposes of this competition unless you indicate otherwise.

* This competition is only open to residents of the UK.

Tim Flannery

This week Australia's climate change commissioner and author, Tim Flannery, talks to the Ecologist about his new book Here on Earth.

Here on Earth is a revolutionary dual biography of the planet and of our species. Flannery reimagines the history of earth, from its earliest origins as a chaotic ball of elemental gases to the teeming landscape we currently call home.