Depends on your understanding of the term "biggest":
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Water vapor. Carbon dioxide is second, by volume. Methane and others are more potent, pound for pound, but there is not as much of them. Increasing CO2 is responsible for climate change, per most climatologists.
The biggest greenhouse gas is carbon dioxide (CO2). It is the most significant contributor to human-induced climate change.
Yes, "greenhouse gas" is a noun referring to gases that trap heat in the Earth's atmosphere, contributing to the greenhouse effect and global warming.
Yes, ozone is considered a greenhouse gas. While ozone in the stratosphere protects us from the sun's harmful ultraviolet radiation, at ground level it can contribute to warming the Earth's surface as a greenhouse gas.
The largest contributor of greenhouse gases into the atmosphere is the oil and gas company Saudi Aramco. They have consistently been identified as one of the biggest emitters of carbon dioxide globally.
No, radon is not a greenhouse gas. It is a colorless, odorless, and tasteless radioactive gas that occurs naturally in the environment. Greenhouse gases, on the other hand, are gases that contribute to the greenhouse effect by trapping heat in the Earth's atmosphere.
Yes, natural gas does emit greenhouse gases when burned. The primary component of natural gas, methane, is a potent greenhouse gas that contributes to global warming. However, natural gas emits fewer greenhouse gases compared to coal and oil when used for energy production.