One piglet from a large litter looks around her small crate as her mother lies immobile beside her. Sows are kept in gestation crates and then farrowing crates in industrial farms, which is the standard way of raising pigs for food. The pollution caused by industrial farming - the mass production of animals - is one of the factors that accelerates climate change. Photo credit: Jo-Anne McArthur / We Animals Media / Essere Animali