It's the time of year for nude food days, doing more with less, planting your own veggie garden and leaving the car at home as CoolAustralia.org, Australia's leading environmental website embarks on it's fourth annual Enviroweek campaign from 20th-24th August.

Enviroweek, a week of action, behavioural change and fundraising for schools around the country, was a great success in 2011 with more than 58,000 students participating across Australia. This year it's set to be even bigger with over 100,000 students expected to take on a green challenge in their pledge to make a difference.