With an increasing population and decreasing vegetation,?

Question

at what point in the future will it start to effect the pacentage of oxegen in the atmosphere?

Answer 1

The earth will have long since been restored by then and we will all be in heaven.

Answer 2

NOW.

More people   ->   More oxygen usage

.|

V

More vegetation consumption

.|

V

Decrease in vegetation

.|

V

Less occurence of photosynthesis

.|

V

More accumulation of carbon dioxide

.|

V

Less oxygen

Answer 3

Well, just to give you an idea of the size of the system, after close onto 200 years of burning carbon-based fuels like mad, we have only caused an increase in CO2 content of the atmosphere by a couple hundred ppm (parts per million).  You would have to really really reduce plant amounts to make any significant difference in oxygen content, and keep in mind that a lot of the plant activity takes place in the water where destruction of land vegetation is irrelevant.  Of course, if we could sterilize the oceans, that could cause a real problem.

Answer 4

All engines "breathe" oxygen too.Every fire uses it too, as does every animal.

Use google earth to look at the planet. You will see quite a bit of green.

Don't panic-take all that propaganda about "we are killing the planet" with a grain of salt.