3. Polar Bears The polar bear population has increased by 5 times from the 50’s to 2005 There are so many polar bears in canada they say it is becoming a problem
4. CO2 Co2 levels have increased and decreased multiple times over the last 400,000 years We are just in a warming period Humans only produce 5% of earths co2
5. Water vapor Water vapor is actually a much more contributing green house gas than CO2 and is completely natural
6. Ocean Currents Ocean current can change the temperatures also El Nino makes certain parts of earth warmer and more damp with more percipitation
7. Past Temperatures The earth has been though heating and cooling phases in the past before human interaction The medieval warming period had even hotter temperatures than today
