Feed sheep tree leaves to cut greenhouse gases, study says 20 January 2021 | Scientists say feeding tree leaves to sheep could help cut greenhouse gases Introducing tree leaves to a sheep’s diet could play an important role in reducing harmful greenhouse gas emissions, new research suggests. Scientists monitored four groups of six Aberfield x lambs, half of which were fed around 200g of goat willow leaves each per day. When their urine patches were monitored, they found significant reductions in both nitrous oxide and carbon dioxide in those groups which fed on willow leaves. The work by the Game & Wildlife Conservation Trust (GWCT) also found lower emissions of ammonia from urine patches where lambs were fed willow.