International spot carbon prices vary from around US$13£8.4.4) a tonne in California to $6 a tonne in China and $9 a tonne in South Korea.
This is intended to work as an escalator tax, pushing the price of carbon emissions up from £16 a tonne in 2013 to £30a tonne in 2020.
Prices have fallen from €20 ($30) a tonne in 2011 to under €3.
Coil steel prices slumped from $600 per tonne in March to $440 in early summer.
We have a carbon tax of $30 a tonne in British Columbia and it works.
Now that the city-dwelling Chinese can afford to eat meat by the tonne, in general they do.
About 3,000 people turned up at the farm to see it – [it weighed one tonne in the end].
Nomura reckons that thermal coal will hit a peak price of $170 a tonne in 2012 compared with $110 now.
Devil rays can grow up to five metres wide and be a tonne in weight, but are harmless plankton-feeders.
According to America's Environmental Protection Agency, the legislation Congress is now considering would set it at $12 a tonne in 2012, rising to $20 in 2020.
COMMODITY PRICE INDEX When nickel prices slumped to a 12-year low of $3,785 a tonne in December, all producers were losing money.
