The pressure inside the chamber is gradually restored to atmospheric levels.

When the cycle is balanced, atmospheric levels of CO2 remain relatively stable.

And how much will atmospheric levels of the gases rise over coming decades?

After elimination of bubbles, the pressure is gradually reduced back to atmospheric levels.

As a result, they add, new approaches must be developed now if atmospheric levels of the gases are to be stabilized.

Even if the chemicals were banned immediately it would take decades for atmospheric levels to drop to where they were in 1985.

It circled just outside the atmospheric level while the men aboard studied the surface for its secrets.

It works well, though probably not at atmospheric levels of CO2.

When they drop their leaves in the fall and go dormant, atmospheric levels of the gas increase.

CO concentration then decreases from about 0.08% to 0.04%, the ambient atmospheric level.