Global WarmingAnd Its Effects

2Global Warming

What is Global Warming?

It is the phenomenon that shows an average rise in the temperature of the Earth’s atmosphere and oceans in recent decades.

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Causes of Global Warming

• Variations in solar activity

Global Warming

• Fluctuations in ocean currents

• Volcanic eruptions

• Greenhouse gases

Most Dominant Factor

4Global Warming

The Greenhouse Effect

The "greenhouse effect" is the warming that happens when certain gases in Earth's atmosphere trap heat. These gases let in light but keep heat from escaping, like the glass walls of a greenhouse.

5Global Warming

The Greenhouse Effect Explained

6Global Warming

A Reality in Pictures

• Glacier National Park, USA 1932

• Glacier National Park, USA 1988

7Global Warming

A Reality in Pictures

• Peru, 1980

• Peru, 2002

8Global Warming

A Reality in Pictures

• Kilimanjaro, 1970

• Kilimanjaro, 2000

9Global Warming

A Reality in Pictures

• Nepal, 1978

• Nepal, 2004

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Global Warming

A Reality in Pictures

Even more obvious from space, these pictures of the North Polar cap from NASA show a melting of 25% in 25 years.

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Global Warming

Effects of Global Warming

• Ice is melting worldwide, especially at the Earth’s poles. This includes mountain glaciers, ice sheets covering West Antarctica and Greenland, and Arctic sea ice.

• Researcher Bill Fraser has tracked the decline of the Adélie penguins on Antarctica, where their numbers have fallen from 32,000 breeding pairs to 11,000 in 30 years.

• Sea level rise became faster over the last century.

• Some butterflies, foxes, and alpine plants have moved farther north or to higher, cooler areas.

• Precipitation (rain and snowfall) has increased across the globe, on average.

Earth after global warming

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Global Warming

Future Effects of Global Warming

• Other effects could happen later in the century, if warming continues.

Sea levels are expected to rise between 7 and 23 inches (18 and 59 centimeters)

Hurricanes and other storms are likely to become stronger

Floods and droughts will become more common

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Global Warming

What Should We Do?

By using energy wisely, we could help reduce the demand for fossil fuel, which in turn could reduce the global warming. We can do the following:

• Reduce, Reuse, Recycle

• Change a light bulb

• Use the “Off” switch

• Plant a tree

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Global Warming

Stop Global Warming

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Global Warming

Sources

• http://environment.about.com/od/faqglobalwarming/f/globalwarming.htm

• http://www.wwf.org.au/our_work/people_and_the_environment/global_warming_and_climate_change/

• http://en.wikipedia.org/wiki/Global_warming

• http://en.wikipedia.org/wiki/Effects_of_global_warming

• http://environment.about.com/od/faqglobalwarming/f/globalwarming.htm

• http://environment.nationalgeographic.com/environment/global-warming/

• http://www.youtube.com/watch?v=ROZJmX73FF4&feature=related

• http://www.youtube.com/watch?v=kkuxXP2kIm8&feature=related

• http://www.youtube.com/watch?v=Jxi-OlkmxZ4

• http://environment.about.com/od/globalwarming/tp/globalwarmtips.htm