On average less than 1%. It is estimated that volcanoes emit on average 200 million tonnes of CO2 a year. This includes all volcanoes, hot springs and and undersea hydrothermal vents. Humans emit 26 billion tonnes (2003) a year by burning fossil fuels. The gas burnt onsite at oil wells in gas flares accounts for more CO2 emissions than all volcanoes put together.
Humans emit 100 times more carbon dioxide than volcanoes.
volcanoes usually release sulphur dioxide, after an eruption.
The amount of carbon dioxide being removed from the atmosphere. (These activities are cutting down and destroying forests.)
Human activities can alter the atmosphere because of greenhouse gasses and aerosols. The greenhouse gasses that are released due to human activities include methane, nitrous oxide, halocarbons, and carbon dioxide.
The atmosphere 4.5 billion years ago was mostly Carbon Dioxide from volcanoes with little or no oxygen in the air. Though, through the process of photosynthesis there is now 71% of Nitrogen, 21% of Oxygen and 0.3 % of water vapour and Carbon Dioxide!
Nitrogen has, since plants and animals have existed, been the majority of gases in our atmosphere. Carbon Dioxide; however, has been increasing in our atmosphere since the industrial revolution. The causes are automobiles, coal-burning power plants and other carbon-emitting activities.
Such an atmosphere on a planet would be the result of carbon dioxide emitted from volcanoes.
volcanoes usually release sulphur dioxide, after an eruption.
Dead trees rotting in the forest.Carbon dioxide escaping from volcanoes.
Most active volcanoes release sulfur dioxide and carbon dioxide into the atmosphere, which is air pollution
The amount of carbon dioxide being removed from the atmosphere. (These activities are cutting down and destroying forests.)
hair spray
The atmosphere doesn't produce any sulphur dioxide. It receives a fair bit from various human activities though.
Human activities can alter the atmosphere because of greenhouse gasses and aerosols. The greenhouse gasses that are released due to human activities include methane, nitrous oxide, halocarbons, and carbon dioxide.
The gas from the volcanoes are like carbon dioxide and carbon monoxide, which are greenhouse gases. They thicken the atmosphere and trap sunlight which heats up the earth
Carbon dioxide that has been taken out of the atmosphere and trapped inside oceans, sedimentary rocks, volcanoes etc. from billions and billions of years ago.
CO2; Carbon Dioxide
Burning of fossil