Greenhouse gases (GHGs) warm the Earth by absorbing energy and slowing the rate at which the energy escapes to space; they act like a blanket insulating the Earth. Its concentration has greatly increased in recent decades due to human activity—no laughing matter, given that it’s a lot more potent than other greenhouse gases. But nitrous oxide (N 2 O), an often-overlooked greenhouse gas, is a significant contributor to global warming. It is best known as laughing gas, but that kind of commercial use makes up only a tiny part of our emissions. About two-thirds of U.S. nitrous oxide emissions from energy use can be traced to mobile sources—primarily, passenger cars and light trucks as well as other motor vehicles ( Table 24 ). But it’s not the one you’d expect: it’s nitrous oxide (N 2 O), also known as laughing gas. Nitrous oxide is a greenhouse gas 300 times more potent than carbon dioxide. Nitrous oxide is a powerful greenhouse gas that lasts for over 100 years in the atmosphere. Carbon dioxide, methane, and water vapour are the most important greenhouse gases. Greenhouse gas, any gas that has the property of absorbing infrared radiation (net heat energy) emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the greenhouse effect. Nitrous oxide is a byproduct of fuel combustion in mobile and stationary sources (Figure 24). Greenhouse gases cause the greenhouse effect on planets. Research by a consortium of 57 scientists in 14 countries found that nitrous oxide has risen by 20% in the atmosphere since the Industrial Revolution and that emissions have accelerated in recent decades due to various human activities. It’s been accumulating in the atmosphere since the 1700s, and it’s powerful and persistent. Nitrous oxide, as a greenhouse gas, is 300 times more potent than carbon dioxide. There’s a greenhouse gas whose concentration is on the rise because of human activities. A greenhouse gas (sometimes abbreviated GHG) is a gas that absorbs and emits radiant energy within the thermal infrared range. Nitrous oxide (N 2 O): Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of fossil fuels and solid waste. By far the biggest way we add nitrous oxide to the atmosphere is by … Nitrous oxide (N2O) Industrial gases: Hydrofluorocarbons (HFCs) Perfluorocarbons (PFCs) Sulfur hexafluoride (SF6) Nitrogen trifluoride (NF3) Other greenhouse gases not counted in U.S. or international greenhouse gas inventories are water vapor and ozone. Nitrous oxide, the "laughing gas" long used by dentists, is also a climate super-pollutant, nearly 300 times more potent as a greenhouse gas than … ... Nitrous Oxide (N 2 O) has a GWP 265–298 times that of CO 2 for a 100-year timescale. Most of us know nitrous oxide as "laughing gas," used for its anaesthetic effects. N 2 O emitted today remains in the atmosphere for more than 100 years, on average.