Pig farm, Geothermal energy, Field sports

Plans are being considered for a 30,000-pig farm in Newtownabbey in Northern Ireland. If approved, the site would be significantly bigger than anything currently operating in the UK. The farmer says he has plans in place to mitigate the smell and waste from the plant, but some campaigners say such intensive pig farms have no place in the UK.

The idea of farmers producing energy is nothing new - biomass plants, anaerobic digestors, solar power and wind turbines are all now established on British farms. But another renewable source of heat is currently being investigated in Scotland. The government there has put money into five projects to see if underground energy can heat homes and businesses, and help to clean up disused mines.

The presenter is Charlotte Smith, the producer in Bristol is Sally Challoner.