High performance transport system for transporting passengers in urban areas, mainly relying on rail systems. Also known as mass transit, subway, underground or metro. Due to their unprecedented traffic density, MRT systems are known to be the backbone of urban transport. They usually belong to a Public Transport authority. 

A colourless, odourless flammable gas that is the main constituent of natural gas. It is the simplest member of the alkane series of hydrocarbons. It is a greenhouse gas with a global warming potential estimated to be 96 over 20 years (GWP20) and 32 over 100 years (GWP100). The GWP100 of carbon dioxide is equal to 1. 

Usually referred to as short distance transport on the Last Mile. It can include walking. Common services dedicated to micro mobility are bike and electric scooter sharing. Micro transit is sometimes also referred to on-demand mini vans or buses. 

Used in the context of climate change, a human intervention to reduce the sources, or enhance the sinks of greenhouse gases. 

In climate policy, mitigation measures are technologies, processes or practices that contribute to mitigation, for example, renewable energy technologies, waste minimization processes and public transport commuting practices.

Emissions from the combustion of fuels in transportation sources (e.g., cars, trucks,  buses, trains, airplanes, and marine vessels) and emissions from off‐road  equipment such as what is used in construction, agriculture, and forestry. 

The ability to move or be moved freely and easily. In a wider sense Mobility is the ability to access things, even if it is virtual e.g. via video conferences, which would not require Transport. It focuses on the satisfaction of needs. To be distinguished from Transport. 

A system in which a wide range of mobility options are provided to customers as a service, i.e. tailored to their needs. The different modes of transport are often integrated, curated, managed and billed by a Mobility Service Provider.  

Concept by which mobility can be obtained when the need arises through a service that does not require a reservation in advance.

Public or private companies that offer mobility services. Not all MSPs are also Transportation Service Providers (TSPs) but are instead only brokers and offer a platform for TSPs. The two terms are often used synonymously.