1/4 of the world's carbon dioxide emissions are from America: its per-capita emissions are also the greatest in the world.

Carbon monoxide is a poisonous substance formed by the incomplete combustion of carbon compounds.

Massive amounts of carbon dioxide are generated every day.

Tropical rainforests produce oxygen and consume carbon dioxide.

Carbon dioxide is not a poison in itself.

The amount of carbon dioxide has increased by 10 percent.

Carbon dioxide sometimes harms people.

It is said that global warming is directly related to carbon dioxide emissions.

The differing volumes of carbon emissions are plotted in the graph below.

Coal consists mostly of carbon.

Trees give off oxygen and absorb carbon dioxide.

That would lead to the production of more carbon dioxide, the main gas responsible for global warming.

Carbon dioxide is a gas that is produced every time a fuel such as coal, oil, or natural gas is burned.

When the ocean absorbs a lot of CO₂, the water becomes more acidic.

All living things on Earth contain carbon.

This material absorbs CO2.

Carbon dioxide is also called carbonic gas.

Carbon dioxide sometimes harms people.