| A | B |
|---|
| ozone layer | a region of the upper atmosphere that absorbs ultraviolet radiation |
| carbon footprint | he greenhouse gases emitted directly and indirectly from a carbon source |
| pollution | waste products that damage an ecosystem |
| reduce | to cut down on the use of resources |
| reuse | to keep items that can be used again |
| recycle | to recover a resource from an item and use it to make a new item |
| greenhouse effect | the process by which gases in the atmosphere absorb heat and heep the earth warm |
| non-renewable resource | a resources that cannot be replaced after it is used |
| carbon monoxide | a colorless, odorless, poisonnous gas made of carbon and oxygen |
| global warming | an increase in the earth's temperature |
| greenhouse gases | carbon dioxide, water vapor and other gases in the atmosphere that absorb infrared radiation from the earth's surface |
| renewable resource | a resource that can be reused |
| carbon cycle | a complex series of processes in which carbon is exchanged within the earth’s surroundings |
| energy conservation | the practice of reducing energy use |
| food miles | he distance food travels from its origin to the consumer. |
| sustainable energy | energy that can be continually provided and maintained over time |
| sustainability | enough for all forever; using just what you need to leave enough for future generations |
