The diagram below shows the overall results for David's project applied to the case study area of Warwickshire.

The WtE options are shown across the top. Combustion technology has been represented in the large, medium and local scale options, while advanced thermal treatment (ATT) has been represented at the medium and local scale.

The criteria on which the options of scale and technology are judged are shown on the left of the picture and down the side. They include emissions to air, land and water, transport impact, the economic cost per tonne of waste processed and the technical maturity of the technology.

Each option score is made up of contributions from the different criteria. For example, the large light green area on the combustion options at all scales represents the value given by the officers to the technical maturity of the technology. The red areas at the top of the medium and local options represent the value given to these options from the savings in transport related impacts.

The key findings of David's project for this case study area are that the local small-scale WtE option using ATT technology is the preferred option, with medium scale ATT and local scale combustion in second place. Medium scale combustion is in third place.

The traditional UK approach is the least preferred option in this case study area, but this may not be the case in more densely populated urban areas, where transport distances are much shorter.