Effects

This guide describes the Effects screen within the LEAP software, which allows users to view, edit, and manage data for environmental effects such as pollutants and greenhouse gases (GHGs). It details the software's default data sets, the ability to customize effects, and the process for setting Global Warming Potential (GWP) values based on IPCC Assessment Reports.

• The LEAP Effects screen provides a default dataset of 258 different environmental effects, including all gases listed in the IPCC's fifth assessment report (AR5 2013). These effects are categorized into major greenhouse gases (GHGs), local air pollutants, major groups of chemicals (such as halons and hydrofluorocarbons), and other impacts like land degradation, deaths, and solid waste.
• LEAP's primary effect calculations are limited to those directly associated with energy use. However, for models at a national scale, the Impact Benefits Calculator (IBC) module can be used to analyze air quality and health impacts.
• Users can configure Global Warming Potential (GWP) values using the IPCC Assessment button to match reports AR1 through AR6. For AR5, users can choose whether to include or exclude climate carbon feedbacks. While LEAP provides 20, 100, and 500-year GWP values measured in tonnes of CO2 equivalent per tonne of pollutant (T CO2e/T), these can be manually edited or overridden within specific scenarios for sensitivity calculations.
• For AR5 and AR6 values, the Effects screen displays additional climate change metrics, including radiative efficiency, lifetime of the effect, Global Temperature Potential (GTP), Absolute Global Temperature Potential (AGTP), and Absolute Global Warming Potential (AGWP) across 20, 50, and 100-year periods. These metrics are provided for information only and are not used in LEAP's calculations, which only output results in physical tonnes or overall GWP.

APA

Stockholm Environment Institute (n.d.). Effects. https://leap.sei.org/help24/Supporting_Screens/Effects_Screen.htm

Chicago

Stockholm Environment Institute. Effects. n.d. https://leap.sei.org/help24/Supporting_Screens/Effects_Screen.htm.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Effects |url=https://leap.sei.org/help24/Supporting_Screens/Effects_Screen.htm |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendeffects, author = {{Stockholm Environment Institute}}, title = {{Effects}}, institution = {Stockholm Environment Institute}, url = {https://leap.sei.org/help24/Supporting_Screens/Effects_Screen.htm}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }