When Will Earth's Air Become Unbreathable?

Unbreathable Air. A rolling death smog that suffocates millions. Our lungs need oxygen, but that is only a fraction of what we breathe. The fraction of carbon dioxide is growing: It just crossed 400 parts per million, and high-end estimates extrapolating from current trends suggest it will hit 1,000 ppm by 2100.

Will air become unbreathable?

Assuming that humans don't mess it up completely, Earth's atmosphere should remain broadly hospitable for many millions of years – but not in the longer term. ... In a billion years it will be about 10 per cent brighter than today, heating the planet to an uncomfortable degree.

Will the earth ever run out of air?

The extrapolated data from these simulations determined that Earth will lose its oxygen-rich atmosphere in approximately 1 billion years. That's the good news. The bad news is that once that happens, the planet will become completely inhospitable for complex aerobic life.