Post on 13-Dec-2015
Climate Change
Climate Change
Any long-term significant change in the average weather of a region or the Earth as a whole
Includes changes in average temperature, precipitation and wind patterns
Potential Causes Carbon dioxide Plate tectonics Solar variation Volcanism Burning of fossil fuels Aerosols and CFCs Land use Deforestation Orbital variation Livestock
Deforestation
The use of trees has more than doubled since the 1960’s
Forests all over the world are over-harvested to meet the increasing demand for forest products
Forests are also being cleared for raising livestock or developing urban areas.
Ozone Layer Depletion
CFCs are still being used in a variety of industrial and household products, such as aerosols and cleaning solvents
CFCs destroy the ozone layer that protects the life on Earth from the sun and UV rays.
Global Warming
The increase in the average temperature of the Earth’s troposphere and oceans since the mid-20th century and its projected continuation
What big event has happened since the mid-20th century?
Effects of Global Warming
Rising sea levels Glacier retreat Arctic shrinkage Extreme weather systems
Causes of Global Warming
The scientific consensus is that global warming is due to the increase in atmospheric greenhouse gases due to human activity
The Greenhouse Effect
The absorption of solar radiation by greenhouse gases
Greenhouse gases include water vapour, carbon dioxide, methane, nitrous oxide, and ozone
These gases ‘trap in’ heat within the troposphere
The Greenhouse Effect
Signs of Global Warming in Canada
Seals and polar bears becoming endangered due to the thawing in the Arctic.
Increase in the number of icebergs in the Labrador Sea.
Changing direction of ocean currents in the North Atlantic.
Rising sea level in Charlottetown, PEI. More thunder and lightning in the north Melting glaciers in the Rocky Mountains
What Can Be Done?
Energy conservation/efficiency Limit deforestation Afforestation: plant new trees Alternative energy sources
The Kyoto Protocol An international agreement to reduce
greenhouse gas emissions This involves making efforts to burn less
fossil fuels This also involves moving away from
fossil fuel energy sources (coal, oil, and gas) to renewable sources of energy (wind, hydro, and solar)
Canada signed the agreement in 2002 and currently all countries have signed except for the USA.