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Across 1. some reflected solar energy gets trapped by _________ 3. increased _______ affect plant and animal life cycles 4. a layer of gases surrounding the planet Earth that is retained by Earth's gravity 6. gas in the atmosphere, byproduct of buring fossil fuels 9. the process of converting used materials into new products to prevent waste of potentially useful materials 10. to use an item more than once 12. planting ______ will help counteract harmful human actions 13. any potentially undesirable substance (physical, chemical or biological) 14. the act of burning fossil fuels

Down 1. the average temperature on Earth is rising! 2. a natural heating that occuring when certain gases in Earth's atmosphere trap heat 5. natural gas, oil, and coal - burned for energy 7. destroying and cutting down forests 8. the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the ecosystem 11. to diminish in size, amount, extent, or number