It is now a known fact that the Earth's surface temperature has risen by 1degree Fahrenheit in the past 100 years, with an expedite warming over the past 20 years. There is genuine evidence that most of this warming over that past 50 years is due to human activities. Human activities have changed the chemical composition of the atmosphere through the increase in the atmosphere of greenhouse gases such as carbon dioxide, methane, and nitrous oxide.
It is has been recorded that there have been increasing levels of greenhouse gases, such as carbon dioxide, in the earth's atmosphere since the Industrial Revolution, which are largely the result of human activities. It is a well-known fact that greenhouse gases trap heat in the Earth's atmosphere and consequently warm the planet. By increasing the levels of greenhouse gases in the atmosphere, human activities are naturally strengthening the Earth's natural greenhouse effect. The greenhouse gases emitted by human activities remain in the atmosphere for long periods, which range from decades to centuries.
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English: View of the crescent moon through the top...
English: Ellsaesser, 1989A warming trend of around 1 degree Fahrenheit has been recorded since the late 19th century. Warming has occurred both in the northern and southern hemispheres as well as over oceans. There are several evidences of global warming, such as the melting of glaciers, decreased snow cover in the northern hemisphere, and warming below ground.
There are several region-specific examples as well, which give us the evidence the impact that global warming has on the world today. The first example is that low-lying areas in the Indian subcontinent, such as Bangladesh and surrounding areas, are regularly being flooded. The flooding can be explained by global warming, which leads to increases in sea levels as glaciers and snows caps melt, and also as water expands when heated, the sea level naturally rises.