exhaust gas - gases that come out of a vehicle, an engine or a machine, fossil fuels - fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago, carbon emissions - carbon dioxide that planes, cars, factories, etc. produce, thought to be harmful to the environment, global warming - a gradual increase in world temperatures caused by gases such as carbon dioxide that are collecting in the air around the earth and stopping heat escaping into space, climate change - changes in the world's weather, in particular the fact that it is believed to be getting warmer as a result of human activity increasing the level of carbon dioxide in the atmosphere:, carbon footprint - Someone's carbon footprint is a measurement of the amount of carbon dioxide that their activities produce., greenhouse gases - a gas that causes the greenhouse effect, especially carbon dioxide, the greenhouse effect - an increase in the amount of carbon dioxide and other gases in the atmosphere (= mixture of gases around the earth), that is believed to be the cause of a gradual warming of the surface of the earth, natural disaster - a natural event such as a flood, earthquake, or tsunami that kills or injures a lot of people:, air pollution - harmful substances in the air, often consisting of waste from vehicles or industry, marine pollution - damage caused to water related to the sea, water pollution - damage caused to water, industrial pollution - damage caused to industry, noise pollution - noise, such as that from traffic, that upsets people where they live or work and is considered to be unhealthy for them:, vehicle pollution - Pollutants produced by vehicle exhausts include carbon monoxide, hydrocarbons, nitrogen oxides, particles, volatile organic compounds and sulfur dioxide, domestic waste - Domestic waste is waste that is generated as a result of the ordinary day-to-day use of a domestic premise, industrial waste - Industrial waste is the waste produced by industrial activity which includes any material that is rendered useless during a manufacturing process such as that of factories, mills, and mining operations., contamination - the process of making something dirty or poisonous, or the state of containing unwanted or dangerous substances :, renewable energy - energy that is produced using the sun, wind, etc., or from crops, rather than using fuels such as oil or coal, landfill - the process of getting rid of large amounts of rubbish by burying it, or a place where rubbish is buried:,

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