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Fifty ways to save our planet
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The human influence on global climate change and disasters

For the New Urban Ninja

Climate change is a change in the statistical distribution of weather over periods of time ranging from decades to millions of years. It may be a change in average temperature or a change in the distribution of meteorological phenomena around a mean (for example, more or less extreme weather events). Climate change may be limited to a specific region, or may occur through the whole Earth.
In recent years the use, particularly in the context of the environmental policy of climate change generally refers to modern climate change. It can be described as human-induced climate change, more commonly known as "global warming" or "anthropogenic global warming" (AGW).
For more information on temperature measurements over different periods, and data sources available, see the temp file. For the attribution of climate change during the past century, see attribution of recent climate change.

Human influences

Main article: Global warming

Anthropogenic factors are human activities that affect the environment. In some cases, the chain of causation of human influence on climate is direct and unambiguous (eg, effects of irrigation on local humidity), while in other cases it is less obvious. Various hypotheses of anthropogenic climate change have argued for many years. Currently, the scientific consensus on climate change is that human activity is most likely the cause of the rapid increase in global average temperatures over recent decades. Therefore, the debate has largely evolved on ways to further reduce the impact of man and to find ways to adapt to change has already occurred.


The greatest concern in these factors is the increase of anthropogenic emissions of CO2 from emissions from burning fossil fuels, followed by aerosols (particles suspended in the atmosphere) and the manufacture of cement. Other factors, including land use, ozone depletion, animal agriculture and deforestation, are also of concern in the roles they play - both separately and jointly with other factors - in affecting climate, microclimate, and measurements of climate variables.

Physical evidence for climate change

Evidence for climate change is taken from a variety of sources that can be used to reconstruct past climates. Reasonably complete records of global surface temperature are available from mid-late 1800s. For earlier periods, most circumstantial evidence of climate change are derived from changes in proxies, indicators that reflect climate, such as vegetation, ice cores, tree-ring records, sea level change, and geology ice.

Historical evidence and archaeological

Main article: History of the impacts of climate change

Climate change in the recent past can be detected by corresponding changes in the settlement and agricultural patterns. Archaeological evidence, oral history and historical documents can provide information on past changes in climate. effects of climate change have been linked to the collapse of civilizations.

Glaciers