global warming: a. an increase in the average temperature of the earth's atmosphere, carbon footprint: b. the amount of carbon dioxide released into the atmosphere  , greenhouse gas: c. a gas in the atmosphere that traps heat above the earth, emission: d. a gas or other substance which is sent out into the air, infectious disease: e. an illness that can be passed from one person to another, especially through the air people breathe, climate change: g. a long-term change in the earth's weather due to changes in the atmosphere, ecological balance: h. a stable ecosystem in which a large number of species live together, heat-related illness: f. poor health resulting from extreme heat,

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