Also on Saturday Christian Aid used a futuristic method to bring home to Festival-goers the impact climate change is having on the world's poorest communities.
The 34th Greenbelt Festival, gathered thousands to a vigil on Saturday evening to reflect on how ordinary individuals working together can impact climate change.
"We're not done with Trade Justice, but that's precisely why we're emphasising environmental issues," Susan Berry of Christian Aid said.
"Trade justice and climate change are intimately connected. We have had some important wins in the Trade Justice campaign but we are concerned that climate change may undermine some of the progress."
Among the entertainment laid on by the charity was a sandpit for children, providing both a play area but also driving home the message that climate change is turning many homelands into deserts.
Festival-goers are also being encouraged to play their part in tackling the issues, from buying fair trade shoelaces to changing their energy supplier.
"We've had a fantastic response," Ms Berry said. "It's been really buzzing today."
There was entertainment of a different kind elsewhere on site. The No Nonsense Theatre Company performed their radical interpretation of Romeo and Juliet.
Drawing on Shakespeare's text as an inspiration, the company used puppetry, clowning, visual theatre and live music to breathe new life into the story and make it as accessible as possible.
"It's our first time at Greenbelt," co-artistic director Liz Fitzgerald-Taylor said. "It's been a great opportunity to not only perform to a wide range of ages but also to people who don't necessarily come to the theatre. We've loved it - and so have the audiences."
To provide a different atmosphere, this year Greenbelt is joined all weekend by the Bassline circus.
"Bassline are no ordinary clowns", a Greenbelt press release says, "this alternative circus troupe are a mixture of beat bopping dance moves, spectacular trapeze manoeuvres and artistic graffiti".
Greenbelt '07 has interfaith items throughout the weekend, with one of the highlights being Mona Siddiqui and Marc Ellis who will be taking part in Sunday's "Can we Coexist?" panel, where leading Muslim, Jewish and Christian theologians explore the prospect for peace in the new millennium.
