What's the true environmental impact of beef farming in UK plus why I've taken up kite-flying..

Beef farming is certainly under the spotlight right now as concerns are raised about its environmental impact from the release of climate damaging methane but is that really the case for grass-fed beef here in the UK? Prompted by a recent BBC2 Horizon programme, 'Feast to save the Planet' I investigate whether the media are telling the public a true representation of the facts behind farming (mainly grass-fed) UK beef.