I have responded to that 20 times. Yes, perturbations of sun and orbit can cause temperature fluctuations. Now, please admit that Man produces atmospheric CO2.
Man does produce CO2. And the earth absorbs or off gases a great deal of it. How much CO2 stays in the atmosphere may be caused by warming or cooling.
The relationship between temperature rise preceding the rise in CO2 at times past is uncertain. What is certain is that unique in the planet's history is the human economic use of fuels on a grand scale that produces significant CO2 emissions. There isn't a reliable climate scientist who denies the greenhouse effect of CO2, regardless of their position on the alleged urgency of climate change today. CO2 levels today and those projected in 50 years in and of themselves will not cause more than small temperature rises. The difference in points of view is to what extent the rise in CO2 will create forcings that will produce greater global temperature rises, that is, the rise in CO2 will cause other temperature changing conditions to arise. The most benign scenario makes the world a little warmer and has modest effects. The most dire scenario paints a catastrophic picture for humanity. Both extremes are speculative.
any scientist telling you the truth will have to tell you given the fact the earth cycles... and the fact that the ice core shows warming preceding CO2 buildup and cooling precedes CO2 dissipation... they have no proof that man made CO2 could not be dealt with by the earth... What we have is guesses that man made CO2 will cause warming. I might even agree with that guess... but less label it what it is... a guess by scientists.