On Eden Projects website you can read about why they are composting:
'Why Eden composts
Maxine Fuller, Waste Operations Manager at Eden, says: 'The whole composting process is a great educational tool for visitors, because they see the journey of their food from the plate through to the plant. It starts as they sort waste from their trays into different containers, and ends as they pass the composting plant which has been deliberately sited near one of the public car parks. It’s Eden’s version of alchemy.''
'What comes out is a potent material that’s either mixed with soil or used as a mulch. 'Using compost made from waste to grow new plants is a great illustration of the Eden philosophy and, from a horticulture perspective, we’re really pleased with the results we’ve seen,' says Eden Project horticulturist Darren Topps.'