DEAR SIR: During the last few weeks, I have followed with interest several discussions regarding global warming, carbon footprint, etc. It would seem that Matt Dempsey fell foul of our scientific brethren for daring to question their science which appears to attach significant responsibility for our current environmental woes to agriculture, and in particular, our ruminant sector. Several solutions have been put forward. Microsoft wants to plant trees, an economist seems to suggest taxing emitters and scientists seem to advocate feeding more grain produced from an oil-based production system as a way of reducing grass intake (and therefore limiting methane production).