The last few days have seen Tim Stowe and Sacha Cleminson updating us on what's happening from the heart of Rio+20, but now it's your chance to dig a little deeper. Between 1 and 2 pm tomorrow, the Guardian is hosting a live web chat with an expert panel from Stop Climate Chaos including Tim (live from Rio), Laura Taylor (head of public policy at Tearfund) and Serguem Jessui Machado de Silva, Tearfund country representative for Brazil.
You can submit your questions about Rio+20 or the outcomes of the summit now by clicking here and make sure you tune in tomorrow to find out more.