Editing Radiative forcing (section)

=== Basic estimates ===

Radiative forcing can be evaluated for its dependence on different factors which are external to the climate system.<ref>{{cite web |url=https://climate.nasa.gov/nasa_science/science/ |title=The Study of Earth as an Integrated System |publisher=NASA |accessdate=2021-05-20 |archive-date=2016-11-02 |archive-url=https://web.archive.org/web/20161102022200/https://climate.nasa.gov/nasa_science/science/ |url-status=live }}</ref> Basic estimates summarized in the following sections have been derived (assembled) in accordance with [[first principles]] of the physics of matter and energy. Forcings (ΔF) are expressed as changes over the total surface of the planet and over a specified time interval. Estimates may be significant in the context of global climate forcing for times spanning decades or longer.<ref name="nrcrf" />   Gas forcing estimates presented in the IPCC's [[AR6]] report have been adjusted to include so-called "fast" feedbacks (positive or negative) which occur via atmospheric responses (i.e. ''effective radiative forcing'').