I see.1- CO2 and solar influences increased the global temperature 1910-1940, it was not just 'natural variability'.
2- From 1940 - 1970 aerosols in the atmosphere slowed climate change, that is pollution and volcanoes, but only temporarily.
http://www.skepticalscience.com/global-cooling-mid-20th-century.htm
So, according to you, increases in man-made CO2 emissions can lead to the following results:
-- An increase in the Earth's temperature.
-- No change in the Earth's temperature.
-- A cooling of the Earth's temperature.
In other words, according to you, it is impossible to determine the effect that increases in man-made CO2 emissions will have on the Earth's temperature.
Got it.
In that case, why has the IPCC spent 25 years issuing reports that make bold predictions about how man-made CO2 emissions will affect the climate?
And why has the IPCC clearly stated that it is only the warming that occurred after 1950 that was driven by human activity?
And why did Michael Mann and so many other climate researchers spend years denying the pause in the 21st century?
And why do the computer-model projections have a 98 per cent failure rate?
(Don't bother spending time on the Skeptical Science propaganda site looking for answers. These are rhetorical questions.)
I am asserting as a statement of rather obvious fact that the trend line for most of the 21st century is horizontal.You really are claiming the red line in this graph is horizontal?
A horizontal trend line means the temperatures are moving in a horizontal direction. It is not the same thing as a "horizontal line".
If you prefer to use NASA's language, you can refer to the "flattening" of the Earth's temperature over the past 15 years.