A review of the IPCC Assessment Report Four, Part 1: the IPCC process and greenhouse gas emission trends from buildings worldwide

The Intergovernmental Panel on Climate Change, (IPCC), Fourth Assessment Report, AR4, Climate Change 2007 consists of three volumes based on the work of three IPCC Working Groups (WGs). WG1 considered the scientific basis of climate change and what the climate models are showing. WG2 considered the consequences of climate change and possible adaptation to it. WG3 considered how the climate change could be mitigated. This paper briefly outlines the history of the IPCC, its purpose and outputs, including the AR4 and its relation to the Kyoto Protocol, and the IPCC authoring process. The paper then reviews the trends in carbon emissions, especially from the built environment (which are a major source of greenhouse gas, GHG, emissions in the world), and the potential mitigation reductions in carbon emissions that are considered possible and the scenarios on which they are based. Practical application: Climate change is an important topic for building services engineers, resulting in the UK in the new, performance-based Building Regulations Part L. This paper outlines the history and relevance of the IPCC for building services engineers as well as reviewing the world trends in carbon emissions from buildings and the future scenarios on which they are based. The paper emphasises the importance of buildings and building services in the context of climate change.