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In 2007, the Intergovernmental Panel on Climate Change (IPCC) released its Fourth
Assessment Report, providing a comprehensive global assessment of climate change. Two of
the main conclusions are that warming of the climate system is unequivocal over the last 100
years, and that most of the increase in global average temperatures since the mid-20th century is very likely due to the increase in anthropogenic greenhouse gases. However, there is still a substantial amount of discussion and misinformation spread in opinion pieces in the media questioning the role of human activity in recent global warming.
This talk will consider many of the arguments that have been used that seek to refute the role of increasing greenhouse gases in recent global warming. It will also briefly present some of the
many lines of evidence that support the IPCC conclusions above.
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