A large group of people sharing the same cultural, linguistic, or ethnic background, often led by a chief or other leader.

The process of using an object again after it has been used, rather than throwing it away.

A term that describes the gradual increase in the Earth's average temperature due to human activities and greenhouse gases.

Very small in size; something that cannot be seen without help, like a microscope.

An item that is safe to eat and can be consumed by humans without harm.

The production of goods and services, often involving factories and businesses.

To dispose of something in a way that removes it from use, often resulting in it being thrown away.

A process where materials are processed and transformed into products through factories and manufacturing.

To use something again instead of discarding it, often with the goal of reducing waste.

The term for a condition in which the Earth's temperature rises due to increased levels of greenhouse gases in the atmosphere.