By Roger Harrabin, Environment analyst, Doha, Qatar
Details have emerged of a deal to solve the "hot air" row undermining the EU in the UN climate change talks in Doha.
The term refers to unused, tradeable carbon emission permits given to Eastern European nations.
They are among a number of issues that threaten to stall progress at the talks, due to end on Friday evening.
Poland had been reluctant to give up its permits; the EU has now said the country can keep them, but has put strict limits on their sale.