passage: Renewable resources can be renewed as they are used .
  An example is timber , which comes from trees .
  New trees can be planted to replace those that are cut down .
  Sunlight is a renewable resource .
  It seems we will never run out of that !
  Just because a resource is renewable , it does nt mean we should use it carelessly .
  If we are n't careful , we can pollute resources .
  Then they may no longer be fit for use .
  Water is one example .
  If we pollute a water source it may not be usable for drinking , bathing , or any other type of use .
  We can also overuse resources that should be renewable .
  In this case , the resources may not be able to recover .
  For example , fish are renewable resources .
  That s because they can reproduce and make more fish .
  But water pollution and overfishing can cause them to die out if their population becomes too low .
  Figure 2.16 shows another example .
query_and_answer: How is timber a renewable energy ? || It comes from trees. New trees can be planted to replace those that are cut down
evidences: Renewable resources can be renewed as they are used . An example is timber , which comes from trees . New trees can be planted to replace those that are cut down .