Global warming is the gradual heating of Earth's surface, oceans and atmosphere which is caused by human activity, primarily due to the burning of fossil fuels that pump carbon dioxide (CO2), methane and other greenhouse gases into the atmosphere. Already, global warming is having a measurable effect on the planet. The phenomenon is an aspect of climate change, referring to the long-term rise of the planet’s temperatures. It is caused by increased concentrations of greenhouse gases in the atmosphere, mainly from human activities such as burning fossil fuels and farming. The impacts of climate change include warming temperatures, changes in precipitation, increases in the frequency or intensity of some extreme weather events and rising sea levels. These impacts threaten our health by affecting the food we eat, the water we drink, the air we breathe, and the weather we experience.

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