Which produces more CO2, volcanic or human activity?Do tell us how much wetlands have warmed in the last 50 years.Wetlands emit 37% of what emissions, specifically? And a source please.
Wetland emissions were NOT a net source until warmed in the last half century by AGW. Are you actually attempting to suggest that human combustion of fossil fuels and deforestation is not responsible for the 42% rise in atmospheric CO2 since the beginning of the Industrial Revolution?
Humans account for 1% of CO2 that volcanoes emit.
Gas studies at volcanoes worldwide have helped volcanologists tally up a global volcanic CO2 budget in the same way that nations around the globe have cooperated to determine how much CO2 is released by human activity through the burning of fossil fuels. Our studies show that globally, volcanoes on land and under the sea release a total of about 200 million tonnes of CO2 annually.
This seems like a huge amount of CO2, but a visit to the U.S. Department of Energy's Carbon Dioxide Information Analysis Center (CDIAC) website (http://cdiac.ornl.gov/) helps anyone armed with a handheld calculator and a high school chemistry text put the volcanic CO2 tally into perspective. Because while 200 million tonnes of CO2 is large, the global fossil fuel CO2 emissions for 2003 tipped the scales at 26.8 billion tonnes. Thus, not only does volcanic CO2 not dwarf that of human activity, it actually comprises less than 1 percent of that value.
A short time ago (geologically speaking) the question "Which produces more CO2, volcanic or human activity?" would have been answered differently. Volcanoes would have tipped the scale. Now, human presence, activity, and the resultant production of CO2, through the burning of fossil fuels, have all climbed at an ever-increasing rate. On the other hand, looking back through the comparatively short duration of human history, volcanic activity has, with a few notable disturbances, remained relatively steady.
The United States Geological Service states that volcanoes produce less than 1% of what humans do.