Question

I'm currently doing a test and I really need some help

Which provides evidence that humans are causing an increase in the carbon dioxide concentration in the atmosphere?

A. The net flux of carbon out of the atmosphere without including the contribution from burning fossil fuels is zero.

B.The net flux of carbon into the atmosphere without including the contribution from burning fossil fuels is negative.

C. The net flux of carbon into the atmosphere without including the contribution from burning fossil fuels is positive.***

D. The net flux of carbon out of the atmosphere without including the contribution from burning fossil fuels is negative.

Answer 1

Seems to me that C is the worst possible choice. It says that CO2 is increasing even without the fossil fuels.

Answer 2

Isn't it increasing without fossil fuels tho? i'm now kind of confused

Answer 3

I do not know if it is increasing without fossil fuels.
However I know it is increasing.
If the net flow NOT including burning fuel is negative
and the net flow into the air is positive.
Then it is increasing due to the burning of fossil fuels