As Chinese people celebrate the new Year of the Pig this week, environmental campaigners are urging them to eat less pork and help save the planet.

China consumes more meat than any other country and accounts for half the world's consumption of pork, which is used in everything from dumplings and stir-fries to hot pots.

That has helped make it the world's biggest emitter of climate-warming greenhouse gases — according to the U.N. Food and Agriculture Organization (FAO), livestock are responsible for about 14.5 percent of global emissions.