Methane is a very, very effective greenhouse gas, and feedlots, as well as landfills for that matter, produce large amounts of them.
However, combustion pollution, as well as oceanic pollution, is still primarily affected by third world. And yes, based on individual income and living conditions, China is third world.
And thank you for mentioning that reduction of energy use, not greener production, is key.
Yes, Methane is a very effective greenhouse gas. However, rain is extremely effective in removing methane from our atmosphere. Methane can not accumulate in our atmosphere to any significant degree, therefore it is not capable of being the cause of Global Warming on planet Earth.
Carbon Dioxide is a very weak greenhouse gas.
The number one source for Global warming and Global Cooling is our Sun. Our Sun caused the 1,000 + years Roman Warm period - which was much warmer than the Medieval Warm Period, and the Medieval Warm Period was significantly warmer than today. The actual increases in Temperatures lead to population explosions, food in abundance as the warming extended the growing season and more misture in the atmosphere. And the increase in Green plants helped reduce CO2. Lands toward the Earth's Poles and all other northern lands became greener.
Reduced radiation from the Sun in the past caused the Great Ice ages here on Earth. The temperatures of other planets in our Solar system warm up and cool down at the same time as the Earth's variation. Thus you can not blame people for the warming variations of our planet.
The Earth also resist temperature changes. When the Earth gets warmer, it puts out more H2O into the atmosphere, blocking the sun rays. This causes Planet Earth get greener, which reduces the Global Warming effects caused by the Sun.
During the Medieval Warm Period, the Earth was quite a bit warmer than today, and caused by the Sun's increased radiation output. During this period, The Earth became greener. Populations rapidly increased around the world, The Artic Ocean's Ice Cap drastically receded, Chinese ships sailed over Canada to the Atlantic Ocean and have maps of their Journey.
Greenland was Green, at least all around it's coast. The Vikings had cities on both east and west coast, and on the West Coast of northernmost Greenland was a Viking settlement. Viking artifacts have been found on the West Coast of the N. America, by land As Far as Minnesota, and as far west as San Francisco, along with remnants of Viking Ships.
In Europe: Sweden, Norway, Poland, and England became World Powers due to population increases caused by Global Warming increasing planting seasons and better and more crops.
When the Little Ice Age Came, the Vikings, Swedes, and the Poles (Cossacks), all ceased to be world powers. England managed to stay a World Power through trade, invention, and colonialism. Germany could no longer produce wine. They switched to Beer!
See also: http://www.oism.org/pproject/
Read what Real Scientists say about Global Warming rather than what the Mass Media and government manipulators are trying to sell the public.
Well, my friends,
Ya got trouble,
Right here in River City!
With a capital "T"
And that rhymes with "G"
And that stands for Gobal Warming!
We've surely got trouble!
Right here in River City!
Trouble, Trouble, Trouble, Trouble ...