The reasons that affect climate change in a region for a long time or for a certain period of time are numerous and complex, and people have not yet been able to say exactly how much various factors affect climate change. Natural factors are still the dominant factors influencing the climate. Human activities are still not enough to affect the basic attributes of regional climates, and even less than the 51 major glacial or interglacial climatic changes. The text is intended to explain:. ['The climate of a region is the result of a combination of factors.', 'The basic attributes of the regional climate depend mainly on natural factors.', 'Human activity is not enough to affect the climate of an area.', 'Human understanding and analysis of climate influences is not enough.']