Across
- 5. billion, the projected world population in 2060
- 6. warming, Rise in temperature of air, land and sea
- 8. the name given to gases that trap heat betwen the earth and upper atmosphere
- 9. the problem gas produced by cattle flatulance
- 11. level, the average sea height between low and high tide
- 12. the waste gases produced from mechanical, industrial and biological processes
Down
- 1. layer protecting the earth from solar radiation
- 2. an estimate of future conditions
- 3. holes drilled deep through earth or ice
- 4. change, change in the average weather in a zone over a long period of time
- 5. a consistent increase or decrease
- 7. refers to living organisms within the community
- 10. organic fuels used for heat, cooking, electricity production and transport