In most systems, the cap gets lower over time, giving businesses a choice: slash emissions further or buy permits on the market from another company. (scientificamerican.com)
Swapping livestock for test tubes would also slash the emission of greenhouse gases belched out by the animals, and avoid the welfare issues associated with farming. (newscientist.com)
Environmental groups have lauded the Obama administration for its work in slashing emissions from dirty coal - fired power plants in the US. (jeffrubinssmallerworld.com)