in other words, there is as yet no incontrovertible  proof either of the greenhouse effect, or its connection with alleged  global warming.
in other words, there is as yet no incontrovertible  proof either of the greenhouse effect, or its connection with alleged  global warming.
james hansen:120
he argued that if the temperature rose 0.4 °c above the 1950–1980 mean for a few years, it would be the "smoking gun" pointing to human-caused global warming.