Which of the following forms of agriculture is most likely to contribute to global climate change?

Terracing is an agricultural practice that involves creating stepped levels on slopes to reduce soil erosion and manage water runoff. While it can lead to some land degradation if not managed properly, it is generally more sustainable than slash-and-burn and does not directly contribute to greenhouse gas emissions at the same level.

Shifting cultivation, or swidden agriculture, involves rotating fields to allow for fallow periods, which can help restore soil fertility. While it can have negative environmental impacts if practiced unsustainably, it generally does not lead to the same immediate and significant emissions as slash-and-burn methods do.

Pastoral nomadism involves herding livestock across vast areas and is typically less intensive in terms of land use compared to slash-and-burn agriculture. While it can contribute to land degradation and emissions through overgrazing, its overall impact on climate change is less severe than that of slash-and-burn practices.