Environmental Audit Committee says the government should promote healthier and more sustainable diets including a reduction of meat and dairy consumption.
Misconceptions about the impact humans are having on the planet are widespread, according to the study by the Policy Institute at King's College London.
Countries meeting for the Convention on International Trade in Endangered Species of Wild Fauna and Flora (Cites) voted to regulate the trade in products from giraffes.
Commons Science and Technology Committee says government policy to support bringing in low-carbon tech delayed, cut back or had undermined emissions reductions.