Question

which of the following activities have contributed the greatest amount of carbon dioxide into the atmosphere over the past 100 years? (points : 2) increased farming and production of grains increased reliance upon coal, oil, and natural gas deforestation of rain forests and other parts of the world volcanic eruptions and widespread forest fires

Answer 1

The answer is the second
one.
Deforestation of rain and forests and other parts of the world volcanic eruptions and widespread forest fires.
This activity has contributed greatest amount of carbon dioxide into the atmosphere over the past 100 years.