which is strange. I suspect, therefore, it means emissions per country rather than emissions per capita - which would mean it wants China to have to start capping its emissions.
Here's a proposal to put to Bush, then: if he wants to count emissions per country, we'll take the world CO2 emissions, divide it by the number of UN members, and see what each country gets, shall we?
22,829,463,200 tonnes
192 members
=118.9 million tonnes/country
Current US emissions: 5,762 million tonnes
So, counting by country, the US would have to decrease it emissions to 2% of their current level, if we kept the total emissions the same as now.
If, however, it was done per capita, it would have to go from 19.47 tonnes/capita to 4.2 tonnes/capita (figures from
Nationmaster; I suspect there may be some statistical errors, but they're in the right ballpark) - ie about 22% of the current US level.
Clearly, the 'per country' accounting is ridiculous. But if it's not 'per country' they mean, then the US is now calling for only the countries with large per capita emissions to be capped - of which the US is 5th (beaten only by the oil-rich Gulf countries like Bahrain). So I can't see what the US negotiators can possibly be aiming at.