The ocean current that significantly affects the climate of Europe is the Gulf Stream. This warm ocean current originates in the Gulf of Mexico, travels across the Atlantic Ocean, and greatly influences the climate of Western and Northern Europe. As a result of the Gulf Stream, countries like the UK and Norway experience milder winters compared to other regions at similar latitudes. The current affects temperature and weather patterns, contributing to the relatively temperate climate found in these areas, which is essential for agriculture and biodiversity.