It includes the cyclical long term patterns as well as the human influences (anthropogenic induced global warming - which is one of the effects measurable in certain places). (hubpages.com)
Short term variations, like a colder than average month, can exist within longer term patterns such as the warming trend over the past 1000 years. (serc.carleton.edu)
Although an examination of how affective rhetoric or emotional appeals relate to politics could be easily implemented in a public opinion survey, the costs of such strategy would be enormous, let alone the fact that establishing long term patterns would be virtually impossible. (blog.politics.ox.ac.uk)