In many tropical rainforests, people clear land by cutting down trees and burning them. after a few years, the soil runs out of nutrients and cannot be farmed any longer. how does this practice of "slash and burn agriculture" affect earth's atmosphere?

The practice of Slash and burn agriculture which has seen an increase in many tropical reagions has an adverse effect on the atmosphere due to the following reasons. Fristly the trees that a felled in order to burn and Secondly the emissions released by the bujring process.

To begin, in order to perform the slash and burn method of farming; one must ether slash as the existing crops that are on the land or bring in new material to burn. In many cases in tropical reagions, deforestation is often utilized inorder to not only increase farm land but to continue the practice of Slash and Burn.

Secondly, when the wood and dried grass are burnt, the burning release CO2 emissions, these emissions are released into the atmosphere. This gas is in part responsible for the Greenhouse effect.  

To conculde the user of Slash and Burn along with deforestation adversely affects the earth's atmosphere.

answer; can have a long term impact on the newborn;