global warming

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global warming? what is the true meaning of global warming? As i searched in the internet,I got the meaning of it....it is the increase in the average temperature of Earth's near surface air and oceans since 20th century and its projection.....here in the philippines,summer is the climate here and it was really hot nowadays.....reports here the causes of over heat here are global warming,so they promote to conserve energy so it will help a little way in our environment....me as a consumer of electricity I turn off the lights and all my appliance if not needed....you guys out there,how do you think you can help in our environment?