greenhouse gas - A gas in the atmosphere that traps heat above the earth, carbon footprint - The amount of carbon dioxide released into the atmosphere, global warming - An increase in the average temperature of the earth’s atmosphere, Emission - A gas or other substance which sent out into the air, infectious disease - An illness that can be passed from one person to another, especially through the air people breathe, heat-related illness - Poor health resulting from extreme heat, climate change - A long-term change in the earth’s weather due to changes in the atmosphere, ecological balance - A stable ecosystem in which a large number of species live together,

Unit: 6-getting started

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