A proxy war by definition is "A war instigated by a major power but itself does not get involved" I know the U.S got involved in Korea. Vietnam and had to help the British keep control during the Greek civil war so I'd go with Afghanistan since the U.S only supplied insurgent groups with weaponry and did not challenge the USSR openly.
Towns in deserts would naturally develop near oases because in a desert there is very little water and the water would be required to grow crops for food along with water to drink.
Answer: 78% carbon, 21% oxygen, 1% other
Explanation:
The problem of waste can be tackled in many ways, such as:
producing less waste (the most important way of reducing waste)
reusing the objects rather than throwing them away after one use
recycling the objects that have to be thrown away
so all the options are correct - all of the above!
