Human beings have existed on Earth for approximately 500,000 years, but civilization has existed for only around 6,000 years. While social change has always occurred, the pace of change has dramatically accelerated in recent centuries. In particular, the most rapid social change has taken place in just the last 50-100 years. Technological developments, economic transformations, political upheavals, and cultural shifts have all contributed to unprecedented levels of social change in the modern world.