Specific purpose: To inform the audience about some effects of global warming so that they are able to discuss the problem surrounding the global warming after my speech.
Humanity is conducting an unintentional, unrestrained and globally perversive experiment whose ultimate consequences could be second only to nuclear war The human race is responsible for the biggest testing in history an experiment to see what will happen to our health and the health of the planet when we make dreadful changes in our climate. This is not a prescribed scientific inquiry. It is an enormous change in the Earth’s environment, and we are gambling our children’s future on the results. Our experiment is called global warming, and it is changing our atmosphere throwing out of balance a delicate system that almost took billions of years to develop. Global warming is a serious problem that cannot be ignored
I. Preview: Explaining the meaning of global warming, process of global warming and the effect of the global warming .
II. Main points:
I. Meaning of global warming: Generally, the global warming means to warming the global either by human being or by the environment but the intricate meaning is the increasing temperature of earth. Some scientists like to mention the global warming as green house effect. “Global warming has reached a level such that we can ascribe with a high degree of confidence a relationship between the green house effect and the observed warming”. (1)
II Cause of global warming:
A. Global climate is changing because of the buildup in the atmosphere of carbon dioxide (CO2), methane, nitrous oxide (N20), and the CFC (powerful green house gases as well as destroyers of stratospheric ozone).(5)
B. Another reason of the global warming is green house effect. About 30 gases produced by human activity have been identified as contributing to the green house effect.
C. The US Government has acknowledged for the first time that man-made pollution is largely to blame for global warming (4). Emission of Co2 and other harmful gases from the man made factories and industries affects the ozone layer of the earth and contribute to the global warming.
III. Effect of the global warming: Nobody would want to live to see the day when global warming directly effects our life. Not since the abrupt end of glacial climates a little over 10000 years ago have temperatures changed as much, or so rapidly. The next century may therefore see large impacts on the human economy, with the first signs already upon us (3). We can broadly divide the effects into three major categories as follows.
A. Rise of sea levels: Rising global temperature are expected to raise sea levels. “New calculations suggest that glacier melt alone would be responsible for a rise of 1 to 23 cm in sea level by 2100.(6)
B. Effect on ecosystem: Global warming are effecting the natural ecosystem such a way that in future more and more plants and animals will have to permanently migrate to find a suitable habitat and some one will not be able to move fast enough. Scientists have predicted that species loss could be as high as 20% in sensitive ecosystems such as northern Canada and Southern Australia.
C. Health threat: ” Since the global temperature is rising, more frequent and more intensive heat waves could result in more heat-related deaths. These conditions could also aggravate local air quality problems, already afflicting more than 80 million Americans. Global warming is expected to increase the potential geographic range and virulence of tropical diseases as well.”(2)
III Conclusion: I have mentioned the meaning of global warming, cause and effect of the global warming at length.
A. I think everybody just can realize that there is no manner in which a complete and sudden stop could be put to global warming, but the rates at which it is taking place could be reduced.
B. I hope there is a quick solution on hand.