Introducing Greenhouse Gases
Greenhouse gases (GHGs) are the gases in the atmosphere that raise the surface temperature of planets such as the Earth. There are many types of greenhouse gases such as Carbon Dioxide (CO2), Methane and Nitrous Oxide. As well as more complicated and bigger named ones like Sulfur hexafluoride (SF6) and perfluorocarbon (PFCs).
Greenhouse gases come from many places. CO2 and Methane for example mainly comes from when we burn fuels such as coal, oil and gas.
While PFCs may be used to keep food from sticking to cookware, to make sofas and carpets resistant to stains, to make clothes and mattresses more waterproof, and may also be used in some food packaging, as well as in some firefighting materials.
Fun fact! Menthane also comes from the burps of cows!
As you can see from the graphic, much of today’s greenhouse gases comes burning fossil fuels to make energy and heat which is used to light up our homes.
But how can GHGs, which make up so much of earth and our lives make our earth warmer? Take a look in the next part!
How do greenhouse gases warm the Earth?
Imagine Earth is like a cozy bedroom, and the atmosphere is like a fluffy blanket covering the bed. Now, just as a blanket keeps you warm by trapping your body heat, Earth's atmosphere keeps our planet cozy by trapping heat from the sun. This is what we call the greenhouse effect.
Here's how it works: sunlight reaches the Earth's surface, warming it up. Some of that warmth is then radiated back into the atmosphere as infrared radiation (heat energy). Just like the blanket traps your body heat, certain gases in the atmosphere, like carbon dioxide and methane act like a blanket that traps this infrared radiation, preventing it from escaping into space. This trapped heat keeps our planet at just the right temperature to support life as we know it.
But, just like adding extra blankets can make you too hot in bed, human activities like burning fossil fuels and deforestation are adding more of these heat-trapping gases to the atmosphere. This is like piling on extra blankets, causing Earth to get warmer than it should be. This is what we call global warming, and it leads to climate change, with effects like melting ice caps, rising sea levels, and more -extreme weather events.
So, while a blanket is cosy and comforting when used just right, too many blankets can make things uncomfortably hot. Similarly, while the greenhouse effect is essential for life on Earth, too many greenhouse gases can lead to problems for our planet.
Not all Greenhouse gases are equal too! Methane for example, is 25 times stronger at making the earth warmer than CO2. But it lasts only 12 years in the air, compared to CO2 at 20 to 500 years.
Meanwhile, 1 kilogram of sulphur hexafluoride (SF6) is equal to 22.8 thousand kg of CO2 equivalents! So it’s 22800 times stronger than CO2 at making the earth warmer! Thankfully not a lot of factories make or use SF6.