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Climate change can also be used more broadly to include changes to the climate that have happened throughout Earth's history. [32] Global warming—used as early as 1975 [33] —became the more popular term after NASA climate scientist James Hansen used it in his 1988 testimony in the U.S. Senate. [34] Since the 2000s, climate change has ...
Cumulative land-use change contributions to CO 2 emissions, by region. [32]: Figure SPM.2b Local vegetation cover impacts how much of the sunlight gets reflected back into space , and how much heat is lost by evaporation. For instance, the change from a dark forest to grassland makes the surface lighter, causing it to reflect more sunlight.
Global change in a societal context encompasses social, cultural, technological, political, economic and legal change. Terms closely related to global change and society are globalization and global integration. Globalization began with long-distance trade and urbanism. The first record of long distance trading routes is in the third millennium BC.
Examples include variability in ocean basins such as the Pacific decadal oscillation and Atlantic multidecadal oscillation. Climate variability can also result from external forcing, when events outside of the climate system's components produce changes within the system. Examples include changes in solar output and volcanism.
The Intergovernmental Panel on Climate Change (IPCC) has organized many of the risks of climate change into five "reasons for concern." [ 1 ] [ 2 ] The reasons for concern show that these risks increase with increases in the Earth's global mean temperature (i.e., global warming ).
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For example, climatologist Kevin E. Trenberth has published widely on the topic of climate variability and has exposed flaws in the publications of other scientists. [6] [7] [8] For past debates and controversies on scientific details see for example: History of climate change science#Discredited theories and reconciled apparent discrepancies
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