How do CO2 and other greenhouse gases affect the Earth's temperature?

• A. They cool the Earth
• B. They thicken the ozone layer
• C. They trap more sun rays, increasing heat
• D. They have no significant effect

Answer: (C)

Greenhouse gases like carbon dioxide (CO2) and methane play a crucial role in regulating the Earth's temperature through a process known as the greenhouse effect. When sunlight reaches the Earth, some of it is reflected back into space, while the rest is absorbed, warming the planet. Greenhouse gases in the atmosphere filter and trap some of this heat, preventing it from escaping back into space. As a result, the atmosphere holds onto heat energy for longer periods, creating a warming effect.

This trapping of heat is what helps maintain Earth's temperature within a range that supports life. Without these gases, our planet would be significantly colder, making it inhospitable for many forms of life. While some level of greenhouse gases is necessary for a stable climate, an excess can lead to global warming and climate change, which are pressing environmental issues today.