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Forcing mechanisms can be either "internal" or "external".Internal forcing mechanisms are natural processes within the climate system itself (e.g., the thermohaline circulation).For example, alterations to ocean processes such as thermohaline circulation play a key role in redistributing heat in the world's oceans.Due to the long timescales of this circulation, ocean temperature at depth is still adjusting to effects of the Little Ice Age A schematic of modern thermohaline circulation.Climate change is caused by factors such as biotic processes, variations in solar radiation received by Earth, plate tectonics, and volcanic eruptions.Certain human activities have been identified as primary causes of ongoing climate change, often referred to as global warming.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.thermal expansion of warming ocean water), or a combination (e.g., sudden loss of albedo in the Arctic Ocean as sea ice melts, followed by more gradual thermal expansion of the water).(a=f);var b=i(a);if(CSS&&! For current and future climatological effects of human influences, see global warming.