EARTH SCIENCE
CLIMATE AND ENVIRONMENTAL CHANGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Greenhouse gases are dangerous and must be reduced by at least two-thirds to halt global warming
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Naturally occurring water vapor is a greenhouse gas, and there is more of it in the atmosphere than CO2
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CFCs are man-made gases used in aerosol cans, refrigeration and A/C that trap heat in the atmosphere
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None of the above
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Detailed explanation-1: -Methane is one of the biggest contributors to global warming, second only to CO₂. The IPCC suggests that this gas is responsible for between 30 % and 50 % of the temperature increase. In fact, it has been estimated that methane, as a greenhouse gas, has given rise to an additional 0.5°C of global warming.
Detailed explanation-2: -Atmospheric levels of carbon dioxide-the most dangerous and prevalent greenhouse gas-are at the highest levels ever recorded.
Detailed explanation-3: -Carbon dioxide is one of the greenhouse gases and an increase in the carbon dioxide content in the atmosphere would cause more heat to be retained by the atmosphere and lead to global warming.
Detailed explanation-4: -Greenhouse gases that occur both naturally and from human activities include water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3).