The Ongoing Energy Revolution

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Across
  1. 2. How big is the energy demand that we have to cover?
  2. 4. The 20th century was a period of increasing use of … fuels.
  3. 6. What was the big solution to the increasing demand of energy?
  4. 7. What replaced horse drawn carriages?
Down
  1. 1. What is solar power more specifically? Solar …
  2. 3. What is the problem with the wind resources? It is to …
  3. 5. For what is the wind industry also favorable except the energy?
  4. 8. Which power is an alternative for the problem?