Credible carbon dating
Climate change was incorporated in the title of the Intergovernmental Panel on Climate Change (IPCC) and the UN Framework Convention on Climate Change (UNFCCC).Climate change, used as a noun, became an issue rather than the technical description of changing weather.General circulation models, based on the physical sciences, are often used in theoretical approaches to match past climate data, make future projections, and link causes and effects in climate change.Accordingly, fluctuations over periods shorter than a few decades, such as El Niño, do not represent climate change.In this sense, especially in the context of environmental policy, the term climate change has become synonymous with anthropogenic global warming.Within scientific journals, global warming refers to surface temperature increases while climate change includes global warming and everything else that increasing greenhouse gas levels affect. In 1966, the World Meteorological Organization (WMO) proposed the term "climatic change" to encompass all forms of climatic variability on time-scales longer than 10 years, regardless of cause.Change was a given and climatic was used as an adjective to describe this kind of change (as opposed to political or economic change).When it was realized that human activities had a potential to drastically alter the climate, the term climate change replaced climatic change as the dominant term to reflect an anthropogenic cause.
For example, alterations to ocean processes such as thermohaline circulation play a key role in redistributing heat in the world's oceans.For temperatures on the longest time scales, see geologic temperature record.Climate change is a change in the statistical distribution of weather patterns when that change lasts for an extended period of time (i.e., decades to millions of years).Internal forcing mechanisms are natural processes within the climate system itself (e.g., the thermohaline circulation).External forcing mechanisms can be either natural (e.g., changes in solar output, the earth's orbit, volcano eruptions) or anthropogenic (e.g. Whether the initial forcing mechanism is internal or external, the response of the climate system might be fast (e.g., a sudden cooling due to airborne volcanic ash reflecting sunlight), slow (e.g.