In the past, ancient solar energy stored as fossil fuel has been so cheap that there has been little incentive to find ways to waste less. Similarly, with current solar energy collected by plants, not only do we waste the energy in millions of tonnes of waste food that goes in to landfill, but the methane gas given off – unless collected – is a very powerful greenhouse gas.
There are now encouraging signs that this is starting to change. A fantastic example is the potato packing and processing plant belonging to Fenmark in Cambridgeshire. Their new anaerobic digestion unit will divert thirty thousand tonnes of food waste each year from landfill to generate electricity and provide heat for water and space heating with the by-product sold as a soil conditioner.
One small step towards food security.