What are the two largest greenhouse gasses?

Answer 1

In every measurable way the two that have the most affect on the natural greenhouse effect are water vapor (up to 75%) and Carbon Dioxide (5 to 25%).

Both are naturally occurring, yet man is producing ever larger portions of CO2. We are currently producing around 3% of all annually produced CO2.

A:Referring to the accelerated greenhouse effect we are now experiencing:

Carbon dioxide (CO2) is the greenhouse gas responsible for the accelerated greenhouse effect, added by humans burning fossil fuels. CO2 is having the largest effect on the recent increases in global temperature.

The other powerful greenhouse gas is methane (CH5) which is produced by cattle, animal manure and is released from melting tundra and lake beds. It is 21 times more powerful than CO2.

Answer 2

There are several greenhouse gases that contribute to maintaining the average global temperature, but the two gases that can add to the greenhouse effect and have been the cause of the recent global warming effect are carbon dioxide and methane. We can increase the atmospheric concentration of carbon dioxide by burning coal, oil and natural gas, and thereby add to the greenhouse effect. We increase the level of methane in the atmosphere by some industrial processes, but a major contributor is belching by ruminants such as sheep and cattle.

Although methane is twenty times as potent a greenhouse gas as carbon dioxide, it is fortunately in much lower concentrations in the atmosphere. Carbon dioxide is therefore the most important gas in adding to the greenhouse effect and causing anthropogenic global warming.

Answer 3

Water vapor is the most dominant greenhouse gas in every measurable way. It is responsible for well over 50% of all warming we observe.

Second in line is Carbon Dioxide which makes up from 5% to 25% of all warming and over 0.03% of our atmosphere.

A:The Answers.com category defines global warming, or global climate change, as a scientific proposal that the Earth's average atmospheric temperature is currently warming up due to increasing levels of greenhouse gases and/or other factors. This distinguishes it from the natural warming effect of greenhouse gases at their long-term normal level.

Although water vapour is more abundant than carbon dioxide, climate scientists say that it is carbon dioxide which is having the greatest impact on global warming. This is because, since the beginning of the Industrial Age, human activities have increased the atmospheric concentration of carbon dioxide by over 35 per cent, from the long term range of 260-280 parts per million (ppm) to the present level of over 380 ppm. Humans do not have the capability to increase atmospheric levels of water vapour in the same way, since precipitation would keep water vapour concentrations at their normal level. It is therefore the anthropogenic increase in carbon dioxide levels that is driving global warming.

The second most important gas in driving global warming is methane. Although it is present in much lower concentrations than carbon dioxide, it is some 21 times as potent a greenhouse gas. Thus, any anthropogenic increase in methane levels is important.

Answer 4

Carbon dioxide (CO2) and methane (CH4) are the two involved in the enhanced greenhouse effect that we are causing.

Carbon dioxide (CO2) and water vapour (H2O) are the two most involved in the natural greenhouse effect (carbon and water cycles).

Answer 5

The two largest greenhouse gases are:

1. Water Vapour, which we cannot control, and
2. Carbon dioxide which we can control by changing from fossil fuels (coal, oil and natural gas) to renewable energy.

Answer 6

1. Carbon dioxide (CO2)
2. Methane (CH4)

Answer 7

Carbon Dioxide and Methane

Answer 8

Carbon dioxide (CO2) and methane (CH4).

Answer 9

Carbon dioxide (CO2) and methane (CH4).