Facts on Climate Change - Proof

Climate variability and climate change — the last 120 million years

CSIRO Atmospheric Research Greenhouse Information Paper

In the long-term past, the planet has been both warmer and cooler than today. Climate fluctuations arise because of changes to the Earth’s orbit, to solar radiation, to the positions of continents, and to concentrations of atmospheric greenhouse gases.

More recently, the 20th century was the warmest of the past 1000 years. The 1990s were the warmest decade of the millennium in the northern hemisphere, and 1998 was the warmest year.

Greenhouse gas increases were the main factor contributing to global warming in the late 20th century.

This information paper examines how global climate has changed throughout history and describes the factors likely to be causing the changes experienced during the past 100 years.

Climate throughout history

The past 120 million years

The Cretaceous Period (120-65 million years ago) was 5-7oC warmer than present and carbon dioxide concentrations were much higher than today. Cooling then occurred during the Tertiary Period to the Quaternary Period (2.5 million years ago). During this time, climate was influenced by the location and configuration of continents, the presence or absence of ice sheets, changes to the Earth’s orbit that affected radiation received from the Sun, and high greenhouse gas concentrations.

Geological evidence shows the Earth’s climate is very sensitive to changes in concentrations of greenhouse gases. Models cannot accurately simulate climate of the past 120 million years without incorporating the heat trapping capacity of these gases.

http://www.cmar.csiro.au/e-print/open/greenhouse_2000c.htm?fbclid=IwAR2TSilHO5z6VYIQELuVNEGmrkfjKxPNQWNS-pYQpJBcpNIW0KfKBLXprpw

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