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Across 1. very believable 4. the ice sheets at the north and south pole (2 Words) 6. bold, fresh, brash 7. a warning, serving as a warning 9. a process in plants and algae that creates oxygen 10. a name for the trapping of heat in the Earth’s atmosphere. (2 Words) 13. to prevent, repair, or delay a problem/change 14. much CO2 is released by burning these (2 Words) 15. roads, electrical grids, transportation, schools 17. supposed, believed 18. increased acid levels in the ocean due to excess CO2 in the atmosphere (2 Words) 19. the primary source of energy for Earth 22. CO2 (2 Words) 23. gases that come from burning fuels in vehicles, for example 24. made by corporations, not public, for individual use 25. to react to, or respond to a change 27. a rather fancy sketch, sometimes 3D

Down 2. duty, responsibility, burden 3. labor agreement for a specific number of years in exchange for a debt or service, no pay (2 Words) 5. leading, notable, big-name 8. advanced, cutting edge 11. CH4 12. wind, waves, sunshine, geothermal vents are all sources of this (2 Words) 16. agreement, accord 20. ideal world or society 21. a period when much of the continents were covered in glaciers is called an______ (2 Words) 26. Parts Per Million