Feeling gassy?

You’ve heard this: We are all hothouse tomatoes, trapped under invisible, gaseous glass and if we don’t stay green we’re going to go overripe faster than you can say ketchup. What’s more, you’re probably aware that the invisible gases fuelling our environmental woes are being tackled with emissions standards, cap-and-trade carbon credits and carbon taxes.

So, since you know all of that, a few simple questions: Do you really know what a greenhouse gas is?

Can you name one? Two? Six? Do you know when and where you produce them?

Well, if you can’t, have no fear; Flow is here to give you the basic whats and wheres of greenhouse gases. After all, they’re as tricky as substances can be. For one, they’re all invisible.

According to the Intergovernmental Panel on Climate Change (IPCC), the four primary greenhouse gases under the Kyoto Protocol are carbon dioxide, nitrous oxide, methane, and ozone (144KB PDF), with each of them assigned a numeric “Global Warming Potential” (GWT) value. The remaining three, all man-made, are sulfur hexafluoride, hydrofluorocarbons and perfluorocarbons.

Below are a few examples of where your actions may have produced some of these tomato-shriveling gases.

Carbon dioxide (CO2)
Where: Your soda
Car exhaust, feedlots, industrial pollution, fossil fuels. Carbon dioxide is the dominant greenhouse gas for a reason—it’s in almost everything we burn, and it’s what we exhale. It’s so common, and because it’s impractical to suggest we all stop breathing, for now let’s concentrate on the C02 that makes those little fizzing bubbles in our Mountain Dew.

Nitrous oxide (N2O)
Where: Your steak
Before your sirloin was medium-rare, it was so rare that it walked, mooed and produced nitrogen-rich manure. Vegetarians aren’t off the hook either, especially if the plants they eat were grown with nitrous fertilizers. If there’s a plus side to animal waste, though, it’s that it doesn’t need to be wasted.

Methane (CH4)
Where: Your trash
Along with CO2, methane is one of the two gases found in “landfill gas”, which smells as appetizing as it sounds. But new energy techniques are trapping this noxious gas and turning it into viable fuel that, when burned, leaves only CO2.

Ozone (O3)
Where: Your car
In fairness to your car, ozone pollution isn’t all its fault. But when its exhaust comes in contact with so-called “volatile organic compounds” in the air, ground-level ozone is created. And while Canadians may be committed to stopping the depletion of the ozone layer, those added ozone gases aren’t helping.

Sulfur hexafluoride (SF6)
Where: Your magic
As far as direct contributions, you’re probably safe here. Short of the electrical industry, which uses the gas to insulate high voltage circuit breakers, the closest you’re likely to come to releasing sulfur hexafluoride is when you decide to wow your friends with your incredibly low voice and magical powers. But while you might not be a burgeoning magician, you certainly do use the magic of electricity every day.

Hydrofluorocarbons (HFCs)
Where: Your cold air
What would summer be without the comforting cold of an air conditioner? Well, for starters, it would see a lot fewer HFCs, which are used in air conditioning units. And before you rush off for your backup popsicle, just remember that your freezer is chock full of HFCs too.

Perfluorocarbons (PFCs)
Where: Your foil
If you’re a fencer and read “foil” with horror, relax: This is the kind of foil that wraps up leftovers, not competitions. PFCs are released during the process of turning alumina into aluminum, a metal you’ve used if you’ve ever had brisket left over to wrap up or used virtually any other modern metal convenience.

Seven greenhouse gases and seven familiar ways we generate them in our daily lives. Their effects are varied, but in addition to their eponymous greenhouse effect, they’re also known to increase the acidity of our oceans. And since the gases clearly aren’t just generated in the limited fields of soda, magic or food wrappings, it’s important to understand exactly how and where they are produced, and how the industries responsible for generating greenhouse gases are dealing with them.

It’s always better to understand the ways your energy use affects the world you live, because even if you’re behind on your reading there’s always time to “ketchup”.