HHI

 
HHI is the acronym widely used to refer to the Herfindahl-Hirschman Index, a measure of market concentration. HHI index ranges from close to zero (a competitive marketplace) to 10,000 ( domination of a market by a single entity, a monopoly) .It is calculated by squaring the market share of each firm competing in a market, and then summing the resulting numbers.


	

Biogenic

 
Biogenic emissions: Emissions that result from natural biological processes, such as the decomposition of vegetative matter. Biogenic emissions include emissions of volatile organic compounds from vegetation and emissions of nitrogen oxides from soil that are not caused by human direct or indirect activities.

Anthropogenic

 
Anthropogenic emissions: Emissions of greenhouse gas emissions that are produced as a result of human activities. The IPCC describes anthropogenic emissions as: “Emissions of greenhouse gases, greenhouse gas precursors, and aerosols associated with human activities. These include burning of fossil fuels (coal, oil and natural gas) for energy, deforestation, and land-use changes that result in net increase in emissions”.