land-use patterns (e.g. growing or clearing forest) are already included in the calculations, as is the CO2 emitted by Limestone when you burn it to make cement, then re-absorbed when you use it to make concrete...

You might find this article interesting:- China overtakes US as top CO2 emitter

China spewed out more carbon dioxide than the United States for the first time last year, making it the world's biggest producer of the primary gas blamed for global warming.

New figures from the Netherlands Environmental Assessment Agency show China produced 6,200 million tonnes of CO2 in 2006, while the US produced 5,800 million tonnes, the Guardian Unlimited news site reports.

"China's 2006 carbon dioxide emissions surpassed those of the USA by 8 per cent," the agency said.

In 2005, China's emissions were 2 per cent below those of the US, it said.

The agency said the figures were based on its own preliminary estimates derived from recent energy and cement production data.

Industrial processes and the burning of fossil fuels - oil, gas and coal - are the main causes of carbon-dioxide emissions.