Pesticide is the overarching term for herbicides, insecticides, and other substances that control pests. Pesticides are often highly debated due to concerns about safety for those consuming the crops but not those picking the crops but that is a whole political debate that I don’t want to start right now.
An herbicide is a pesticide that kills weeds. Often called weedkillers, herbicides can protect crops from weeds as well as anything that the weeds attract including animals, insects, and diseases.
Sustainability is the ability to maintain or stay at a level. Oftentimes, manufacturers and businesses are not sustainable because there is not an equal balance of output and gains. This also applies to the earth. Without sustainable agriculture, the environment becomes too affected by the production and in turn the production becomes affected because their was not enough balance to ensure sustainability.