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Global Warming

Zach & Sarah
by

Zach Moran

on 27 February 2013

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Transcript of Global Warming

Sarah & Zach Global Warming Introduction What Causes Global Warming? "Carbon dioxide is the main greenhouse gas emitted by humans. Human activities are altering the carbon cycle by adding more CO2 to the atmosphere and by influencing the ability of natural sinks, like forests, to remove CO2 from the atmosphere. While CO2 emissions come from a variety of natural sources, human-related emissions are responsible for the increase that has occurred in the atmosphere since the industrial revolution."

The combustion of fossil fuels in cars, factories and electricity production.
Methane released from landfills and agriculture.
Nitrous oxide from fertilizers and gases used for refrigeration and industrial processes.
The loss of forests that would help stop these gases from staying in the atmosphere. How Has Global Warming Affected the World? The statistics on global warming are quite startling but even today some people are still questioning the validity of global warming. This information shows us that global warming is very real and our world is changing faster than we think. Why Is Global Warming A Problem? Some people say that global warming is a good thing as our climate is becoming warmer and we are experiencing less snow and warmer weather. In fact, global warming is a very serious issue and if it is not stopped our world will be very different in the years to come. Public Perception The number of Americans who believe in global warming and its validity has gone up over the years as there is more information in the media etc. In fact, 67% of Americans believe in global warming with 42% of those people blaming human activity for the increased temperatures and 19% on the earth's natural weather patterns. Although this is the case, a big proportion of the population still questions global warming and its causes. Surprisingly seniors aged 65+ are skeptical that global warming is caused by humans with just 28% blaming this theory. 53% of scientists aged 29 and under blame human activity for the problem. Impact on wildlife Certain species of butterflies, foxes, and alpine plants have migrated North to higher altitudes where the temperature is cooler.

In the last 30 years researchers have discovered that the Adelie penguins of Antarctica have diminished from 32 000 breeding pairs to 11 000.

Polar Bears are having an especially hard time with global warming. Their habitat of Arctic ice is disappearing quickly and they are having trouble finding food. Global Warming is the gradual increase in the earth's atmospheric temperature which has a drastic effect on our climate and even society. Throughout this presentation you will learn everything you need to know about global warming, its effects and how you can help stop it. Whenever these gases are released into our environment they form a "blanket" in our atmosphere. When the sun's energy enters our atmosphere these rays are reflected by numerous factors on our earth and in our sky. As these rays are traveling back towards space they are becoming trapped by this "blanket" in our atmosphere. As a result, these rays are making our earth's climate become hotter which results in global warming.
The average temperature on earth is now 15 degrees celsius. This is an increase of 0.74 degrees celsius over the past 100 years.
The last two decades have been the hottest in 400 years and quite possibly the hottest for this millennium.
Arctic ice is disappearing and the region may be completely ice free for the summer of 2040.
Scientists believe that global warming may also help cause another ice age as ocean currents are being affected in the Atlantic Ocean.
Between 1870 and 2004, global average sea levels have risen 195 mm. As North America warms disease carrying insects are migrating to our climate which is causing more humans to become ill with diseases. Scientists believe that as the earth warms there will be "wars on water" which may affect Canada as we have 10% of the world's supply. Economies are affected as hurricanes can cost billions to local and federal governments. There are 5,773,000 cubic miles of water in ice caps, glaciers, and permanent snow. If all glaciers melted today the seas would rise about 230 feet. Smog is becoming more common and the death rate of smog is expected to go up 5% for 2050. Global warming also brings extreme cold weather for short periods of time. As a result of this, crops will die and humans will be affected as well. Numerous species have become extinct as their climate is changing and they cannot find food. Impact on society Global warming is really affecting our earth more than we can see, a rise in temperature by half a degree isn’t noticeable on human skin but for the planet it is a drastic change.

Ice is melting everywhere all over the world, as we learned last week snow covered ice reflects the majority of the sun’s light where as the ocean absorbs the majority, so once the ice begins to melt the more ocean there is to absorb heat so the process become self reinforcing.

As a result of this the sea level is rising at a scary rate as the years go on; islands are even starting to shrink.

The earth's temperature is not just rising but we are experiencing more rain as our weather patterns are being affected by this warming.

The mercury in the center of our earth has already heated up more than one degree Fahrenheit.

As you can probably tell global warming is not a problem for the future, it is happening now. We must do our part to stop this process as it is ruining our earth. Future
If nothing is done about global warming humans will be at risk of dying of heat related illness. Once a human's core body temperature exceeds 41 degrees celsius their body will no longer be able to regulate its temperature which will cause heat stroke. Heat stroke is an extremely serious issue which will likely end in death if left untreated.

Mountain glaciers will disappear therefore many people will lose their water supply.

If the earth's temperature rises two degrees celsius over a third of all living species will face extinction.

Our chance of avoiding a rise in temperature of two degrees celsius is 93% if we reduce our greenhouse gas emissions by 60% by 2023. Solutions In order to stop global warming we must simply reduce our greenhouse gas emissions. To do this we need to increase our:

Energy efficiency and our vehicle fuel economy

Wind and solar power energy production

Hydrogen production from renewable sources

Biofuel production and use

Natural gas production and use

Nuclear power production Global warming is a very serious issue that is happening right now. If we do not act now our world's climate will become too out of control to help. Thankfully there are many ways in which we can cut back on our emission of greenhouse gases, but it will take everyone's commitment. Conclusion National Geographic
National Aeronautics and Space Administration
United States Environmental Protection Agency
Full transcript