This explains the large difference in opportunity costs on a per tonne basis between the two approaches.
The cost saving was 57% per tonne.
Operating costs ranged between $3.0 and $3.6 per tonne of sulfur.
For example, its reclaimed aluminium typically raises £1,000 per tonne, compared to £50 per tonne for rival technologies.
The corresponding break-even values for natural gas plants are substantially higher, near $60 per tonne.
For the same set of assumptions, the cost of transport is US$0.399 per tonne lower in the Central US and US$0.200 per tonne higher in the Northeast US.
The result indicates a 90% probability that the cost per tonne of CO2 is between US$1.033 and US$2.633 per tonne of CO2 transported in the Midwest US.
Now that waste is segregated, the average disposal cost has gone down by 14% per tonne and the process produces 27% less carbon per tonne.
The price has slumped from €417.50 (£298) per tonne this time last year to €335 per tonne, a fall of nearly 20%, according to Steelfirst.com.
Add this to the £2,612 per tonne they receive for their quality crop, and they earn £3,732 per tonne – £1,856 more than under Fairtrade, or a 101% increase.
The price of the nuts has reached $10,500 £6,3000) per tonne, compared with $6,500 £3,9000) per tonne in February, according to Michael Stevens, a trader at Edinburgh-based Freeworld Trading.
