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Across 1. structure that has large blades attached to an engine and that is used to produce electricity 6. an inorganic molecule with the chemical formula O3. A major air pollutant in the lower atmosphere but a beneficial component of the upper atmosphere 8. the heating of the atmosphere owing to the presence of CO2 and other gases 10. any material from living things that can be used as energy source 15. energy source that can be replaced as it is used or cannot be used up 17. energy released during nuclear fission or fusion, especially when used to generate electricity

Down 2. energy source that is used faster than it can be replaced 3. heat energy inside the Earth that can be used to heat buildings and produce electricity 4. the broader set of changes that go along with global warming; including changes in weather patterns, oceans, ice, snow, and ecosystems 5. a trend of rising average temperatures around the world 7. materials provided by the Earth that can be used to make more complex products 9. generating electricity using flowing water to drive a turbine that powers a generator 11. the action of taking out something, especially using effort or force; examples of resources are coal, oil, and natural gas 12. the kinetic energy of wind, harnessed and redirected to perform a task mechanically or to generate electrical power 13. the careful use and management of resources 14. processes that use energy from the sun to generate heat or electricity 16. as energy resource that formed over millions of years from the decayed remains of ancient plants and animals