From Envirowiki

This is a conversion page, to make easy conversions and comparisons between a tonne of carbon dioxide and other weights, volumes and random measurements.

Carbon Dioxide is either a gas, or a solid (dry ice), never a liquid a normal pressures (it sublimes from one state to the other).

[edit] 1 how much?

Carbon Dioxide levels in the atmosphere naturally vary between about 190 parts per million by volume (ppmv), and 280 ppmv, currently, largely due to anthropogenic carbon emissions, it's around 381 ppmv. this is roughly equivalent to 570 ppm by weight, which is equal to 2.97 × 10¹² tonnes of CO2 (2.97 million million)(wikipedia).

This means that since the since the industrial revolution atmospheric carbon levels have increased by 165 ppmw (110ppmv), or 8.39 × 10¹¹, or 839 thousand million tonnes.

This level fluctuates by about 5ppmv every year, due to the northern hemisphere's deciduous forest cycles.

Global anthropogenic carbon dioxide emissions are currently around 24 thousand million tonnes per year.

[edit] 2 One tonne of Carbon Dioxide Gas

one tonne of carbon dioxide

• 505 m³ at room temperature (gas), or 0.625 m³ as a solid.
• is produced by burning ~385 kilograms of black thermal coal, (1 tonne of coal =~2.6 tonnes of carbon)

[edit] 3 sources

• Carbon Dioxide on Wikipedia.org - source of much of the information on this page.
• List of countries by carbon dioxide emissions on wikipedia