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: The '''Earth's Atmosphere''' has not always had the same proportions of [[gas]]es. 3.9 [[billion]] [[year]]s ago there was no [[Oxygen]] in the [[atmosphere]]. In the last 200 years humans have caused the [[Carbon Dioxide]] in the '''Earth's Atmosphere''' to double.
===Earth's Resources===
: Earth's resources are the parts of the [[Earth]] that [[human]]s can use to survive, build technology and provide power.
: The resources on Earth are limited. Which means they can run out if we use them all. This means it's important to [[recycling|recycle]] our resources.
: The resources humans need to survive are; fresh water, food and building materials. For this we need unpolluted rivers, land to grow crops and trees and rocks to build our homes.
: The resources humans need to build technology are; [[metal]] [[ore]]s and [[Crude Oil|crude oil]].
: The resources humans need to provide power are; [[Crude Oil|crude oil]], [[coal]], [[Natural Gas|natural gas]], [[Nuclear Fuel|nuclear fuel]], [[biofuel]], [[Solar Power|sunlight]], [[Wind Power|wind]], [[Hydroelectric Power|river]]s, [[Tidal Power|tides]], [[Wave Power|waves]] and [[Geothermal Power|geothermal vents]].