Cows emit carbon gases but they also eat grass, and while grass grows it absorbs carbon gases from the atmosphere. So the gases emitted by cows represent a short-term carbon cycle which is 'sustainable'.
This is far less harmful than the real danger, which is mining oil and gas and burning it, because that emits carbon into the atmosphere that was laid down millions of years ago - and too much of that is being emitted for nature to deal with in a short time.
This is one of the feedback loops of global warming. Global warming melts the ice and oceans. This releases methane (CH4) hydrates from the bottom of the ocean. The methane is a powerful greenhouse gas that in turn causes more global warming. So more methane melts, and so on.
Primarily Carbon Dioxide and Methane.
global warming
methane
Global warming is the result of increased levels of greenhouse gases (carbon dioxide and methane, largely) in the atmosphere.
Main gases contributing to global warming are carbon dioxide, methane, nitrous oxide, chlorofluorocarbons, and water vapor
Methane gas is a significant green house gas that contributes to global warming.
Methane, carbon dioxide, CFCs (chlorofluorocarbons).
It is a green house gas, which cause global warming.
Global warming doesn't produce any gas. It is caused by greenhouse gases like carbon dioxide and methane.
Greenhouse gases (carbon dioxide and methane, mostly) cause global warming by increasing their levels in the atmosphere. This turns the benign greenhouse effect into an accelerated greenhouse effect which is causing global warming.
methane gas and flooding are to main reasons