Based on the numbers provided, it would appear humans contribute less than 4% of the total output annually to the carbon emissions cycle.
So a 4% mortage over 50 years is insignificant?
That's 4% added systematically. Every. Single. Year. Or 40% over 10 years. Or 400% over 100 years (relative to the first year, if we burn at a constant rate). That carbon doesn't go away, but is spread out in all components of the carbon cycle.
The increased amount of CO2 in the atmosphere is very well documented through measurements, and this increase clearly have antropogenic origin. We have fewer CO2-measurements of the oceans, but those show increased levels of carbon, as well. As for carbon levels in the biosphere the case is less clear, although there are indications of faster plant growth.
In any case, my point remains; this problem, if it is one, is not nearly so impending as a whole plethora of other, much more pressing concerns, all considerably more tangible.
I can relate to that, and I respect your point of view. Although I don't agree with it -- I hold the climate change as one of the most pressing problems the humanity must tackle.
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