Global Warming

World Issues; Global Warming and the Environment

Specific Purpose: To persuade my audience that global warming is not harmful to the environment.

Central Idea: Global Warming is caused naturally, done in cycles, and can also be beneficial to the environment.

Introduction

I. In recent years the media has focused in on the hyped debate of climate change, better known as Global Warming. There have been movies, articles, and television specials all dedicated to making it very clear that people have got choices to make and sides to choose on an issue that they say no doubt effects us all.

II. Unfortunately some people don't know or understand the whole truth of what's going on in the world around them, but luckily there is no real danger.

III. Today I will discuss natural factors involved in global warming, and how these effects can be beneficial to our earth.

(Transition: Lets' begin with some of the natural factors involved in global warming.)

Body

I. There are many factors that contribute to the warming of the earth, the largest of them being natural factors such as water vapor, and the sun.

A. According to the CDIAC [The Carbon Dioxide Information Analysis Center] a primary climate-change data and information analysis center of the U.S. Department of Energy. Greenhouse gas changes correlate closely with temperature changes, suggesting that greenhouse gases have an important role in global temperature changes.

B. A 2001 study done by the CDIAC, found that of the causes of the greenhouse effect water vapor and water vapor alone was the largest contributor, contributing to 65% of the gas emitted.

C. Along with water vapor another major natural contributor to climate change is the sun itself.

1. According to Sallie Baliunas an astrophysicist at the Harvard Smithsonian Center for Astrophysics. Today we are able to look at the changes in the sun's energy output going back as far as then thousand years. By looking at tree rings to see the changes in climate, we are able to see the ups and downs in temperature. With this we can see that the last thousand years and even into the twentieth century match with the changes of temperature from the far past. What does this mean? In other words activity on the suns surface changes the temperature of the earth, when the sun is warmer the earth warms when the sun cools the earth follows suite.

i. This is caused by changes in what is called solar magnetism, which is emitted by the sun. The ups and downs in temperature correlate almost perfectly with the changes in solar magnetism on the sun. This effect was recorded to be happening thousands of years ago as well as in the recent past and is being seen today.

(Transition: Now lets' take a look at how these effects will be beneficial to the earth itself.)

II. According to Dennis T Avery, author of Global Warming Ð'- Boon for Mankind?. Between 900 A.D. and 1300 A.D. the earth warmed by 4-7 degrees Fahrenheit, stunningly close to what scientific models predict for the twenty-first century. What does this mean for us? Well history showed us that the warming contributed to one of the most favorable periods in history. Crops were plentiful, death rates diminished, industry expanded, and art and architecture flourished. Human bodies are made to survive in a tropical climate, so isn't it obvious why such evolution was happening at such a time?

A. One of the biggest things people are told about global warming is that CO2 [Carbon Dioxide] is the thing we as humans are contributing