When farming the land is not a food idea.
Agriculture has been practiced for many thousands of years and is one way for impoverished peoples to take care of themselves.
Producing crops is one of the simplest sustainable and cheap ways to convert energy from the sun into energy fit for human consumption and the sustaining of life.
However subsistence farming should not be practiced just anywhere. Tropical jungles are not great places for widespread farming to become entrenched.
Tropical soils are typically poor and generally not well suited to long term crop production, consequently land resources are quickly exhausted and therefore the subsistence farmer needs to clear more land to meet basic needs.
This had led to rampant deforestation due to slash and burn practices.
Slash and burn agriculture not only destroys virgin forest which help sequestrate carbon dioxide and produce oxygen but it releases carbon dioxide from the burned matter and from the disturbed soil.
Recently, in 2015, it was shown that on many of those days, the forest clearing fires in South East Asia, contributed more to emissions than all of the economic activity in the US on the same day.
More recently however it has been determined that the peatlands in the Congo basin hold huge reserves of carbon dioxide and that should these areas begin to be cleared and drained for farming it could result in a huge Carbon dioxide explosion similar to the types of methane emissions if the permafrost tundra melts rapidly.