Casper writes on international climate policy; he is co-director of the UK Youth Climate Coalition and a recent University of Warwick graduate.
A G20 communiqué indicates that eliminating the estimated $250 billion to $500 billion countries pay to make fossil fuels cheaper will now be made "voluntary" and "member specific."
All the latest from day four of the climate change summit from our man in Copenhagen.
The leaked draft text has greatly upset delegates from developing countries, Left Foot Forward reports live from the climate change summit.
Gordon Brown praised by delegates at the Copenhagen summit, but European Union still has more to do.