Global WarmingGlobal Warming, in brief, is the warming of the Earth. Our planet, Earth, is continually being warmed by different sources (for e.g. gases in the atmosphere, ultraviolet rays from the sun etc.) This total process of warming of the earth due to different reasons is called the Global Warming. But why do we need to be so cautious of it? The truth is that certain human activities are affecting this process in a negative way. Industries and modern factories release gases in a large amount which enter the atmosphere and stay there. They have the ability to absorb heat and also to send it back towards earth. In this way, the planet's overall temperature starts increasing. This in turn results in more diseases and more severe natural disasters thus causing thousands of deaths.