And the animals usually avoid their own waste, so that reduces the amount of good grazing space even more.

VOA: special.2010.01.19

He says that skyscrapers are clearly popular around the world because they provide a huge amount of shelter and use less land space.

VOA: special.2010.03.31

They warn that the amount of junk in Earth's orbit is increasing and, as it does,the risks to satellites and space vehicles,also rise.

VOA: standard.2010.07.24