there are many lines of evidence which clearly show that the atmospheric co2 increase is caused by humans.
there are many lines of evidence which clearly show that the atmospheric co2 increase is caused by humans.
scientific consensus on climate change:130
scientific consensus on climate change
the introduction includes this statement: there is strong evidence that the warming of the earth over the last half-century has been caused largely by human activity, such as the burning of fossil fuels and changes in land use, including agriculture and deforestation.