Clean technology, also called cleantech or climatetech, is any process, product, or service that reduces negative environmental impacts through significant energy efficiency improvements, the sustainable use of resources, or environmental protection activities. Clean technology includes a broad range of technology related to recycling, renewable energy, information technology, green transportation, electric motors, green chemistry, lighting, grey water, and more. Environmental finance is a method by which new clean technology projects can obtain financing through the generation of carbon credits. A project that is developed with concern for climate change mitigation is also known as a carbon project.

Carbon offsetting is a carbon trading mechanism that enables entities such as governments or businesses to compensate for (i.e. “offset”) their greenhouse gas emissions by investing in projects that reduce, avoid, or remove emissions elsewhere. When an entity invests in a carbon offsetting program, it receives carbon credits. These "tokens" are then used to account for net climate benefits from one entity to another. A carbon credit or offset credit can be bought or sold after certification by a government or independent certification body. One carbon offset or credit represents a reduction, avoidance or removal of one metric Tonne of carbon dioxide or its carbon dioxide-equivalent (CO2e).