1) Internal variation
2) - 107,029) Window dressing
Reason 107,030 for the pause is global cooling.
Occam's Razor.
Frankly, we should WANT global warming, as increased crop yields from rises in CO2 would benefit humanity more than any human efforts. But I know I'm talking to deaf ears...
What global cooling would that be? Surface temperatures are still rising albeit more slowly. Ocean temperature increases have accelerated. The measured radiative imbalance at the ToA has been accelerating. There is no global cooling taking place.
I trust you mention Occam's Razor in a humorous context.
Global warming and increased CO2 levels within bounds will increase some crop yields. The benefit, however, will be grossly overwhelmed by the negative consequences.