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CO2 emissions are directly responsible for climate change.

Before I begin I would like to initially reinforce the topic of the debate: CO2 emissions are DIRECTLY responsible for climate change. As the negative, I will rebut the affirmative as to why CO2 emissions (whilst adding to the heat of the planet) are not directly responsible for the changes we are experiencing on our Earth today. The affirmative stated statistics such as- 'CO2 is the largest factor of global warming', '97% of scientists agree global warming is man-made', 'CO2 is the largest greenhouse gas threat'. Whilst these points may be tried and tested, they do not favour the topic when the phrase 'directly responsible' is included. From what I gather, the affirmative believes that CO2 is speeding up the process of global warming. Whilst this may be true, in between the lines of this statement we can discover that another factor is actually CAUSING the process of global warming. As the negative, I believe that the cause is the fluctuation of the Earth's orbit (which the affirmative incorrectly stated as 'stable') and the consistent rise and fall of the planet's historical temperatures. I stand by the points I raised in the first round and have now refuted the rebuttal put forward by the affirmative and regarded it as invalid. Does the affirmative have anything within it's case to state why my reason for global warming is incorrect? Do they believe that CO2 emissions are the initial cause of the Earth heating world-wide? By now, they should surely agree that CO2 emission are not directly responsible for climate change.