Growing plants
Chemical geological processes (happening in the Oceans).
Organisms that make calcite shells (that then become buried by geological processes).
Planting trees everywhere.
it reduces it
The more carbon dioxide in the atmosphere, the higher the temperature.
Trees perform photosynthesis and so they PRODUCE OXYGEN. All creatures need oxygen in the air to breathe, so trees make the air breathable.
Parks are full of green vegetation which takes carbon dioxide from the air. Replacing a park with buildings will mean a rise in carbon dioxide levels.
Planting trees everywhere.
No car can actually reduce the amount of carbon dioxide in the air, but an economical car will add less additional carbon dioxide to the air than a less economical one.
Cutting down trees does increase the amount of carbon dioxide in the air because trees take the carbon monoxide in the air and turn it into oxygen in a process called photosynthesis. Without as many trees then there is going to be more carbon dioxide in the air.
it reduces it
The more carbon dioxide in the atmosphere, the higher the temperature.
Carbondioxde in atmospheric air amount to about 0.04%.
Carbon dioxide would decrease in that case, since plants break down the carbon dioxide.
A growing maple tree
Carbon dioxide IS air
Trees perform photosynthesis and so they PRODUCE OXYGEN. All creatures need oxygen in the air to breathe, so trees make the air breathable.
There is no carbon in air but in the atmosphere there is 387 PPMV (parts per million by volume) present in the form of CO2 carbon dioxide.
You can, and you do. There's a small amount of it in the air we breathe.