Carbon Dioxide

Carbon dioxide (CO2) is a naturally occurring colourless and odourless gas that is a normal part of the atmosphere.    Each molecule contains one carbon atom and two oxygen atoms bonded together.

IUPAC Name: Carbon dioxide

Molecular Formula: CO2

Molecular Mass: 44

CO2 is exhaled by humans and animals as a result of respiration.  It is absorbed by plants during photosynthesis and by bodies of water, particularly the sea.  As such a natural cycle, called the carbon cycle, is formed.  As a result carbon dioxide is present in low concentrations in the air we breathe.

Carbon dioxide is also a greenhouse gas, it can trap heat in the atmosphere.  Whilst levels of carbon dioxide in the atmosphere naturally vary over time, they can also be affected directly by human activities.  The major source of human carbon dioxide emissions is fossil fuel combustion.  CO2 emissions are also a product of forest clearing, biomass burning, and other industrial processes like cement production.  Carbon dioxide is used as the baseline reference to compare the effect of all other greenhouse gases (carbon dioxide equivalent).

Cavity Insulation Guarantee Agency

The Cavity Insulation Guarantee Agency provides independent 25 year guarantees for Cavity Wall Insulation fitted by registered installers in the UK and Channel islands.

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Chartered Institution of Building Services Engineers

The Chartered Institution of Building Services Engineers (CIBSE) received its Royal Charter in 1976. It is the professional body that exists to support the Science, Art and Practice of building services engineering, by providing our members and the public with first class information and education services and promoting the spirit of fellowship which guides our work.

CIBSE promotes the career of building services engineers by accrediting courses of study in further and higher education, by approving workbased training programmes and providing routes to full professional Registration and Membership, including Chartered Engineer, Incorporated Engineer and Engineering Technician. Once qualified, CIBSE offers a range of services, all focussed on maintaining and enhancing professional excellence throughout a career.

As one of its many functions, CIBSE provides an accreditation scheme for energy assessors.

Find out more here.


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See Cavity Insulation Guarantee Agency


See carbon dioxide