Recent examples include statistics on numbers of cattle for studying greenhouse gasses, and details on the growing of arable crops in assessing the effect of pesticide usage.
Mae enghreifftiau diweddar yn cynnwys ystadegau ar nifer y gwartheg ar gyfer astudio nwyon tŷ gwydr, a manylion am dyfu cnydau âr wrth asesu effaith defnyddio plaladdwyr.