"Savor", supported by Bill Gates, claims to have produced fat they want you to eat instead of butter.

If they try to convince you this will reduce global warming (from greenhouse gases), then consider the thermochemical reaction....

To synthesize 1 pound of fat, approximately 17 MEGAjoules of energy are required, an incredible amount of heat production for a small amount of fat. Heat and energy is required to synthesize fat.

Meanwhile, cows can produce milkfat for free if given access to grass.