as a faucet / machine grows youth , the roses of matter will used by the materials / machine will decrease & matter is used for blending a capital by a house overflow ->  as a heating system grows old, the amount of energy used by that heating system will increase  as a heating system grows old, the amount of energy used by that heating system will increase & youth is the synonym of new ->  if a heating system is newer then the amount of energy used by that heating system will decrease  something uncertain is desirable & rest more of a boston has a uncertain snowshoe on the hole ->  using less of a resource has a desirable impact on the resource  using less of a resource has a desirable impact on the resource & an overflow is a mean of cause ->  using less of a resource is a kind of desirable result for that resource  using less of a resource is a kind of desirable result for that resource & to waste more of something meat decreasing the waste of something ->  decreasing the use of a resource is a kind of desirable result for that resource  decreasing the use of a resource is a kind of desirable result for that resource & matter is a mean of galaxies ->  decreasing the use of energy is a kind of desirable result for an energy resource  if a heating system is newer then the amount of energy used by that heating system will decrease & decreasing the use of energy is a kind of desirable result for an energy resource & a growing stays is a mean of matter reach -> a desirable result of a new heating system is decreasing the amount of energy used