https://skepticalscience.com/human-co2-smaller-than-natural-emissions.htm

The CO2 that nature emits (from the ocean and vegetation) is balanced by natural absorptions (again by the ocean and vegetation). Therefore human emissions ...

https://www.dailysignal.com/2009/03/27/man%E2%80%99s-contribution-to-global-warming/

Mar 27, 2009 ... Of that two percent, “planet-killing” carbon dioxide comprises only ... are real but carbon is such a small portion of the natural cycle, and let's not ...

https://wattsupwiththat.com/2014/07/29/epa-document-supports-3-of-atmospheric-carbon-dioxide-is-attributable-to-human-sources/

Jul 29, 2014 ... Seems like Mankind is not a big “player” — unless one believes Nature is so “ balanced and invariant” that a 1.5 percent change in Natural CO2 ...

http://www.drroyspencer.com/2014/08/how-much-of-atmospheric-co2-increase-is-natural/

Aug 27, 2014 ... I frequently get asked the question, if natural CO2 emissions are about 20 times what anthropogenic emissions are, how do we know that all of ...

https://www.newscientist.com/article/dn11638-climate-myths-human-co2-emissions-are-too-tiny-to-matter/

May 16, 2007 ... It's true that natural sources are huge, but they are balanced by natural sinks - human contributions are tipping this balance.

https://notrickszone.com/2013/03/02/most-of-the-rise-in-co2-likely-comes-from-natural-sources/

Mar 2, 2013 ... The proponents of the theory that man's production of CO2 has resulted in this ... The natural CO2 flux to and from oceans and land plants amounts to .... If over the years the percentages of Carbon-13 and Carbon-14 are ...

https://scripps.ucsd.edu/programs/keelingcurve/2018/09/19/is-the-current-rise-in-co2-definitely-caused-by-human-activities/

Sep 19, 2018 ... The rise in CO2 is unambiguously caused by human activity, principally ... As it happens, about 57 percent of the emissions have remained in the air. ... in the atmosphere, oceans, and land biosphere cannot be natural either.

https://www.climate.gov/news-features/understanding-climate/climate-change-atmospheric-carbon-dioxide

Aug 1, 2018 ... Human activities, mainly burning fossil fuels, are increasing the amount of carbon dioxide in our atmosphere, amplifying the natural ...

https://sciencing.com/percentage-carbon-dioxide-up-earths-atmosphere-4474.html

Apr 25, 2017 ... What Percentage of Carbon Dioxide Makes Up the Earth's Atmosphere? ... This natural cycle becomes perturbed by the addition of extra ...

https://climate.nasa.gov/blog/984/

Sep 18, 2013 ... Measuring natural and fossil fuel CO2. ... Overall, volcanoes release about 5 percent of the equivalent amount of CO2 released by humans.