The ClimateTechnology Centre and Network (CTCN) promotes accelerated, diversified and scaled-up transfer of environmentally sound technologies for climate change mitigation and adaptation in developing countries, in line with their sustainable development priorities. Climate technologies include equipment, techniques, practical knowledge and skills needed for reducing greenhouse gas emissions and adapting to climate change. 
Through itsservices, the CTCN aims at addressing barriers that hinder the development and transfer of climate technologies, thereby becoming a catalytic force in creating the enabling environment for reduced greenhouse gas (GHG) emissions and climate vulnerability, improved local innovation capacities, and increased investments in climate technology projects.
The CTCN facilitates the transfer of these technologies through three core services , which will be attuned to demands as they emerge:
- Provide technical assistance to developing countries to enhance transfer of climate technologies
- Provide and share information and knowledge on climate technologies
- Foster collaboration and networking of various stakeholders on climate technologies
The first core service is responding to direct requests for technical assistance submitted by developing countries through their National Designated Entities, or NDEs. Technical assistance can be provided along all stages of the technology cycle: from identification of technology needs, through assessment, selection and piloting of technological solutions, to assistance that supports theircustomization and widespread deployment.
The other two core services – information and knowledge sharing, and networking and collaboration – are not triggered by specific country request, but rather initiated based on common needs identified by the CTCN and other stakeholders. As an example of these CTCN drivenservices, the CTCN is providing training for NDEs in order to ensure that they are fully prepared and able to play their roles and in a position to make optimal use of CTCN services.
The interrelationship between the services and how they are steered by demand is illustrated in Figure 1.
Figure1: Hierarchy of CTCN services
 Adapted from IPCC, 2000 - Bert Metz, Ogunlade Davidson, Jan-Willem Martens, SaschaVan Rooijen and Laura Van Wie Mcgrory (Eds.) Cambridge University Press, UK. pp 432