Natural selection, he argues, favored increased intelligence to deal with challenges posed by climatic fluctuations in ice ages.

Agriculture in Africa is susceptible to climatic fluctuations, especially droughts which can reduce the amount of food produced locally.

Examples include major climatic fluctuations, such as the Azolla event, which created the current Arctic climate.

Pollen evidence indicates that there were climatic fluctuations from cooler to warmer climates throughout this stage.

Some scientists continue to argue that natural climatic fluctuations may be responsible for the rise.

Scientists believe that large-scale climatic fluctuations like the Pacific oscillation affect the global temperature.

Valley glaciers respond rapidly to climatic fluctuations with typical response times of 10-50 years.

The period witnessed a relative stabilization of the Earth's general climate, ending the previous pattern of erratic climatic fluctuations.

And how might natural climatic fluctuations modify and interact with whatever climate changes caused by people are in store for the future?

The impact of climatic fluctuations on arable crop production, however, is now forcing us to adopt a policy of caution.