what i came up with within an hour for public speaking

Good afternoon to the judges, fellow competitors and fellow friends. I will be talking about the Greenhouse Effects. Today, we are facing an obvious problem due to climate change which caused by the greenhouse effects.

What do we know about greenhouse effects?
How far do we know about the earth?
How serious are the problems we are facing now?

As we know, our earth is surrounded by windows. We call this windows, atmosphere. We need the atmosphere, without it, the earth would be as cold and lifeless as the moon. The problem is that our atmosphere is changing. Why? It is because some of our favorite activities creates gases that pollute the atmosphere. As the gases build up, the atmosphere keeps in too much heat.

What are greenhouse gases?
Greenhouse gases includes CO2, methane gas, nitrogen oxides, chloroflourocarbon, as well as water vapour. The CO2 - every humans and animals produce CO2 everytime we exhale, but there is nothing we can do about it. The main source of CO2 is the burning of fossil fuels; coals, oils, gasoline and wood. Nitrogen oxides - given off by vehicles as we drive and coals from the burning power station as they generate electricity. Methane gas - produced by rotting plants and by households garbage as the deteriorates in landfills. Humans and animals also gives out methane gas. Methane gas are emitted from human when we pass gas. Animals, cows for example gives out methane gas when it burps.

As we all know, in every negative situation has its negative side effects. We've been creating these gases for a long time. But now we are producing too much of it and they are making the globe hotter by the day. What will happen if average temperature on earth increases just by few degrees?
- Ice berg of North and South Pole would melt which would cause the sea level to rise. If these happens, people living near the ocean could be flooded. Some places would be too hot to live in. Besides that, crops would no longer crops. As things got even warmer, living creatures would die and become extinct. Pests such as rats and mosquitoes would multiply in warmer climate.

Earth's Natural Remedies:
Generally, we know that gases soaked up naturally. Sea water absorbs CO2 and so do the tiny organism in the sea called plankton. But because plankton absorbs more CO2 in colder water as the greehouse effect warms up the ocean, plankton would absorbs less CO2. Besides that, plants - especially trees also absorbs CO2. Due to deforestation and rainforest burning, there are fewer trees to absorb the greenhouse gases. What's worse, rainforest burning produce even more CO2. In fact, it is one of the greatest contribution to the greenhouse effects.

However, the natural remedies itself is not enough. So, what can we do?
First of all we can cut down the usage of energy. Turning on the lights, opening the refrigerator, turning on the heat and taking a ride in the car are examples of activites that requires the usage of energy such as electricity, gasoline, and natural gas. The power station that generates the electricity and the automobile engines that burns gasoline all creates enormouse amount of CO2.

Last but not least, GO GREEN.

Thank you.

my speech =) as far as i could remember. what i've writen on the paper is slightly different from what i have delivered.