So what is the punchline - overall climate change has been good for the world (on average).
The Economic Impact of Climate Change in the 20th Century
By: Tol, Richard S. J.
The national version of FUND3.6 is used to infrapolate the impacts of climate change to the 20th century. Carbon dioxide fertilization of crops and reduced energy demand for heating are the main positive impacts. Climate change had a negative effect on water resources and, in most years, human health. Most countries benefitted from climate change until 1980, but after that the trend is negative for poor countries and positive for rich countries. The global average impact was positive.
Keywords: Climate change/impacts/Impacts of climate change/Human health