Agriculture replaced hunting and gathering as a main means of procuring food during the first agricultural revolution. Since then, many agricultural innovations have paved the way to an increased global food supply.

In one sentence, identify the main driver of agricultural innovation.
In 2–3 sentences, explain two innovations in subsistence farming and two innovations in commercial farming.
In 2–3 sentences, describe an issue related to agricultural sustainability, and present an argument from different sides of the debate.