emissions

Definition

Emissions are substances that are released into the atmosphere from human activities. They can be gases, liquids, or solids.

Some common emissions include:

Carbon dioxide (CO2): The most common greenhouse gas, CO2 is released when fossil fuels are burned.
Nitrogen oxides (NOx): NOx are released when fuel is burned at high temperatures. They can react with other substances in the atmosphere to form smog.
Sulfur dioxide (SO2): SO2 is released when coal and oil are burned. It can react with water vapour in the atmosphere to form sulfuric acid, which can cause acid rain.

Emissions can have a number of negative effects on the environment, including:

Climate change: Greenhouse gases like CO2 trap heat in the atmosphere, which can cause the planet to warm.
Air pollution: Smog, acid rain, and other forms of air pollution can harm human health and the environment.
Ocean acidification: When CO2 dissolves in the ocean, it forms carbonic acid, which can make the ocean more acidic. This can harm marine life.

There are a number of things that can be done to reduce emissions, including:

Using less energy: This can be done by driving less, using energy-efficient appliances, and turning off lights when you leave a room.
Switching to cleaner fuels: This includes using renewable energy sources like solar and wind power, and using cleaner-burning fuels like natural gas instead of coal.
Improving energy efficiency: This means making sure that our homes, businesses, and factories use energy as efficiently as possible.

How can the word be used?

Air pollution emissions can cause health problems, such as asthma and lung cancer.

Different forms of the word

Noun: emission, discharge, release.

Verb: to emit, discharge, release.

Synonyms: exhaust, effluent, discharge.

Etymology

The word "emissions" comes from the Latin word emittere, which means "to send out". The word emittere is made up of two Latin words: e (out) and mittere (to send).

Question

What can you do to help reduce emissions?

AQA Science Exam Question and Answer

Question:

Explain the concept of emissions and their impact on the environment. Describe the sources and types of emissions, such as greenhouse gases and air pollutants. Discuss the consequences of high emissions on climate change, air quality, and human health. Provide examples of strategies and technologies to reduce emissions and their importance in mitigating environmental impacts.

Answer:

Emissions refer to the release of substances, such as gases and particles, into the atmosphere. They can originate from natural processes, like volcanic eruptions, or human activities, including burning fossil fuels, industrial processes, and deforestation. Greenhouse gases, like carbon dioxide and methane, trap heat in the atmosphere, leading to global warming and climate change. Air pollutants, such as nitrogen oxides and particulate matter, can deteriorate air quality and harm human health.

High emissions contribute to severe environmental problems, including more frequent extreme weather events, air pollution-related illnesses, and disruptions in ecosystems. To combat these issues, countries and industries are adopting measures like transitioning to renewable energy sources, implementing emission standards for vehicles and factories, and promoting sustainable practices. Reducing emissions is vital in mitigating the impacts of climate change, preserving air quality, and protecting human well-being and the environment.