Care International is repelling criticism that outdoor charity challenges can damage the environment by launching an eco-friendly fundraising event.
Organised together with renewable energy supplier Ecotricity, the two-day 'Eco-Adventure Challenge' to be held next August comprises cycling, canoeing, running, rope-climbing, orienteering and abseiling down a wind turbine.
Each participating team of three is required to raise £3,000 as well as completing the challenge.
Alex Brooks-Johnson, head of challenge at Care International, said: "The importance of protecting the environment will be stressed during the activities."
A proportion of the money raised will be used to plant trees to offset the carbon dioxide emissions created by participants' cars.