Vocabulary Terms

2. Emissions of gases, which are released into the atmosphere, such as carbon dioxid, that trap heat and cause global warming.
3. cost The value of the best alternative that is given up when a decision is made.
5. constraints Limits in a system that prevent it from handling more demand, for example overcrowded trains or buses.
6. Indirect effects of an activity that affect others but are not reflected in the price, like pollution or noise.

1. Describes a process, product, or activity that requires a large amount of inputs such as time, money, labor, energy, or raw materials.
4. monocultures The over-reliance on a single mode of transport which leads to rigid, inefficient, and unsustainable infrastructure.