The fourth IPCC report on international climate change (2007)confirmed that human activity has produced climate change beginning in the mid-20ᵗʰ century.

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The statement is true. The Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change (IPCC) in 2007 concluded that "warming of the climate system is unequivocal" and that "most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic (human-caused) greenhouse gas concentrations."

The Fourth IPCC Report on International Climate Change (2007)confirmed That