Overall emissions declined, too, by 10% between 2008 and 2011.
The cap itself is lowered over time, bringing overall emissions down.
The total number of permits would not exceed an overall emissions target.
(I'd probably still do it, but others wouldn't, and overall emissions would fall).
A second government adviser, Hu Angang, has said China should start cutting overall emissions from 2020.
The Scottish Environment Protection Agency said that brought overall emissions down by 34% since 2007.
Retiring permits from the trading system ensures they can't be used elsewhere, reducing overall emissions.
Christof Ruehl, BP chief economist, said that fuel switching had little impact on overall emissions.
Decreasing red meat consumption, for example, could reduce overall emissions from agriculture, he said.
Overall emissions have been rising in Canada in recent years, after dipping during the 2008 recession.
Nowhere was the inconsistency between these proposals and overall emissions reduction noted by the chancellor.
