negative impact of global climate change

Negative Impact Of Global Climate Change

TED TALK FINALTHURSDAY (Feb 11) - 8 PM

Presentation Outline

I. The main causes of global climate change.

II. What are the main cause of climate change?

2.1 Natural causes of climate change.

2.2 Human causes of climate change .

III. Impacts of Climate Change.

The causes of climate change can be divided into two categories, human and natural

causes.

The earth’s climate is influenced and changed through natural causes like

Volcanic eruptions : When a volcano erupts it throws out large volumes of sulphur dioxide

(SO2), water vapour, dust, and ash into the atmosphere. Large volumes of gases and ash can

influence climatic patterns for years by increasing planetary reflectivity causing atmospheric

cooling. Tiny particles called aerosols are produced by volcanoes. Because they reflect solar

energy back into space they have a cooling effect on the world. The greenhouse gas,

carbon dioxide is also produced however the CO2 produced is insignificant when compared

to emissions created by humans.

I. The main causes of global climate change.

Ocean current : The oceans play an important role in determining the atmospheric

concentration of CO2. Changes in ocean circulation may affect the climate through

the movement of CO2 into or out of the atmosphere.

The earth’s orbital changes : The earth makes one full orbit around the sun each year.

It is tilted at an angle of 23.5° to the perpendicular plane of its orbital path. Changes in

the tilt of the earth can lead to small but climatically important changes in the strength

of the seasons, more tilt means warmer summers and colder winters; less tilt means

cooler summers and milder winters.

Solar variations : The Sun is the source of energy for the Earth’s climate system.

Although the Sun’s energy output appears constant from an everyday point of view,

small changes over an extended period of time can lead to climate changes.

2.1 Natural causes

II. What are the main cause of climate change?

2.2 Human Causes

Climate change can also be caused by human activities :

Burning of fossil fuels.

The conversion of land for forestry and agriculture.

The Industrial Revolution.

Ongoing emissions of greenhouse gases because it have the potential to

warm the planet to levels that have never been experienced in the

history of human civilization.

Activities

We are eating ours Planet!!!

II. Impacts of Climate Change.

Appendix

http://www.climatechange.gc.ca/default.asp?lang=en&n=65CD73F4-1

http://www.climatechange.gc.ca/default.asp?lang=En&n=036D9756-1

http://www.climatechangechallenge.org/Resource%20Centre/Climate-Change/3-

what_causes_climate_change.htm#2.

12

Thank You For Your Attention