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2) There is no serious doubt that atmospheric CO2 has recently increased.
3) There is no serious doubt that the increase in CO2 is anthropogenic.
The isotope signature gives it away.
1) There is no serious doubt that the recent increase in temperature is
unprecedented over the last 1000 or 2000 years.
4) There is no serious doubt that item (3) explains item (2). Since item (2)
in turn explains item (1), this means that the warming is anthropogenic.