Question

with your class
what have we figured out so far about gasoline, diesel, and other carbon - based fuels? how might answering those questions help us think about our future transportation system?

Explanation:

The problem is about carbon - based fuels and future transportation, which relates to the study of energy and its applications in transportation. In the Natural Science discipline, the subfield of Engineering (or Environmental Sciences) is relevant as it deals with energy systems and transportation infrastructure. But more precisely, the subfield of Chemistry (since carbon - based fuels involve chemical properties and reactions) or Engineering (for transportation systems) could apply. However, as it's about understanding fuels and their impact on transportation, the subfield of Engineering (specifically related to energy and transportation) or Environmental Sciences (due to the environmental impact of fuels) is appropriate. But the most probable subfield in Natural Science for this question is Environmental Sciences as it deals with the impact of fuels on the environment and future systems.

Answer:

The subfield in Natural Science that best applies is Environmental Sciences (or Engineering, Chemistry depending on the focus, but Environmental Sciences is more about the impact on future systems).