Western Europe before 1000 was a difficult place to live for peasants, with cold weather and a lack of political, economic, and environmental stability. After 1000, changes included developments in politics, human interactions with the environment, and economics, while social structure, political structure, culture, and some economic aspects remained the same. The Byzantine Empire was politically similar to Tang and Song China and Islamic civilization under the Umayyads, influencing many regions while maintaining a political structure like Western Europe at the time.