Agriculture sciences seek to feed the world’s population while preventing biosafety problems that may affect human health as well as the environment and its surrounds.
Chemical engineers design large-scale processes that convert chemicals, raw materials , living cells, microorganisms and energy into useful forms and products.
Mechanical engineers are constantly pushing the boundaries of what is physically possible in order to produce safer, cheaper, and more efficient machines and mechanical systems.
The petroleum industry include the global processes of exploration, extraction, refining, transporting (often by oil tankers and pipelines), and marketing petroleum products.