The place where a population (e.g., human, animal, plant, or microorganism) lives and its surroundings, both living and non-living.

Habitat fragmentation

A process during which larger areas of habitat are broken into a number of smaller patches of smaller total area, isolated from each other by a matrix of habitats unlike the original habitat.


A collective term for the group of partially halogenated organic species, which includes the chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), halons, methyl chloride and methyl bromide.

Halt Fossil-fuel Finance Pledge

A landmark deal announced at COP 26 to end international public financing for fossil fuels and to challenge the narrative that oil, coal and gas are necessary for the development of low-income countries.

Hampel Report, The (1998)

A report published in 1998 containing recommendations from the Committee on Corporate Governance which cover the role of directors, directors’ remuneration, the role of shareholders, and accountability and audit.

Hampton Alexander Review (2016)

An independent review commissioned by government in the United Kingdom, to ensure that talented women at the top of business are recognised, promoted and rewarded.

Happy Planet Index

A measurement of happiness that incorporates measurements of well-being, life expectancy, equality, and ecological footprint.


The potential occurrence of a natural or human-induced physical event or trend that may cause loss of life, injury or other health impacts as well as damage to and loss of property, infrastructure, livelihoods, service provision, ecosystems and environmental resources.

Hazardous Substance

Any substance (solid, liquid, or gas) that can be detrimental to human health.

Heat island

An urban area characterised by temperatures higher than those of the surrounding non-urban area.

Heat wave

A prolonged period of excessive heat that is often combined, except in arid areas, with excessive humidity.

Heating, ventilation, and air conditioning (HVAC)

Heating, ventilation and air conditioning technology is used to control temperature and humidity in an indoor environment such as buildings or vehicles, providing thermal comfort and healthy air quality to the occupants.

Herding behaviour

How individual decisions are influenced by group behaviour.


An assumption that heterosexuality is natural, ideal, or superior to other sexual preferences.


The belief that heterosexuality is superior or “normal” compared to other forms of sexuality or sexual orientation.


A person who is sexually attracted to people of the opposite sex.

Hidden Bias

See Unconscious Bias

Higgs Report, The (2003)

A report produced by Sir Derek Higgs who was asked to evaluate the role, quality, and effectiveness of nonexecutive directors among British companies.

High-Level Climate Champions

Under the UNFCCC COP, people appointed to connect the work of governments with the many voluntary and collaborative actions being taken by non-state actors.


The Holocene is the current interglacial geological epoch, the second of two epochs within the Quaternary period, the preceding being the Pleistocene.

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