“The Elders' generation got agreements signed and solutions designed. But let’s be honest here: most actions for sustainable development are cosmetic, ignorant or thwarted.”

27-year old Swedish activist Sara argues for a more radical approach. Exactly one month before Rio+20, she asks how we can make the most of this moment; what lessons we can learn from the Arab Spring and Occupy; and whether it's possible to bridge the gap between the UN and the grassroots movement.

"The great challenges we all face are very clear: poverty eating away at our social fabric; our dwindling ecosystems; the well-documented threat of climate change... And yet so many of our leaders tend to put these challenges right at the bottom of their agendas."

How can we reconcile the demand for economic growth with a fairer and more sustainable future? Archbishop Desmond Tutu asks the Youngers – who come from Sweden, Brazil, Nigeria and China – how they tackle the idea that progressive action on sustainable development is something only wealthy countries can afford.