A change in global or regional climate patterns.
climate change
A gradual increase in the overall temperature of the earth's atmosphere.
global warming
A layer in the earth's stratosphere at an altitude of about 10 km (6.2 miles) containing a high concentration of ozone, which absorbs most of the ultraviolet radiation reaching the earth from the sun.
ozone layer
The amount of carbon dioxide released into the atmosphere as a result of the activities of a particular individual, organization, or community.
carbon footprint
Economic development that is conducted without depletion of natural resources.
sustainable development
Chemical waste material capable of causing death or injury to life.
toxic waste
Energy from a source that is not depleted when used, such as wind or solar power.
renewable energy
It's a process that occurs when gases in Earth's atmosphere trap the Sun's heat.
greenhouse effect