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Increase in the concentration of several greenhouse gases in the atmosphere during the last few decades has warmed up the atmosphere, a phenomena popularly known as ‘global warming’. Greenhouse gases (water vapor, carbon dioxide, methane, ozone, and nitrous oxide) greatly affect the temperature of the Earth. Without these greenhouse gases, Earth’s average temperature would be considerably lower. However, it is specifically the carbon emissions in the atmosphere, which have scientists worried. Most scientists agree that we are in a period of gradual global warming (approximately 0.7 degrees Celsius in the last century), and that the greenhouse effect prevents our climate from becoming a deep freeze. Most also agree that the level of CO2, including man-made CO2, in the atmosphere has increased in the last century, and that global warming is due, partially, to the greenhouse effect. Efforts are on to explain this temperature anomaly and it may take time to say conclusively whether ‘global warming’ exists or not.