Hawthorn hard-man Brad Sewell has taken on a green challenge for Enviroweek, pledging to "carpool for the week".

Enviroweek, held from 12 - 18 September, is a week of action and a time to drive behavioural change and fundraising for environmental organisations.

Sewell is aiming  to change behaviours of his family and friends for long-term change whilst raising money for environmental charity Cool Australia Trust.

During Enviroweek, Australians are urged to pledge their own challenge or sponsor family, friends and co-workers to take on a ‘green’ challenge.

The challenge is up to each individual!

To join Sewell and register your own 'green' challenge head to enviroweek.org to find out more.