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It is much simpler: We know what we emitted since we know how much fossil fuel has been burned. And that’s twice as much as has accumulated in the atmosphere. So nature hasn’t been a source but a sink: oceans and forests took up half. And that’s also observed fact. www.climate.gov/news-feature...
How do we know the build-up of carbon dioxide in the atmosphere is caused by humans?Fossil fuels are the only source of carbon dioxide large enough to raise atmospheric carbon dioxide amounts so high so quickly.www.climate.gov