The major ocean current that influences the climate of Western Europe is the North Atlantic Drift. This warm current is an extension of the Gulf Stream and plays a crucial role in moderating temperatures across the region. It brings warm air from the tropics, leading to a milder climate, particularly in countries like the UK and Ireland. The North Atlantic Drift is essential for maintaining the temperate conditions that support diverse ecosystems and agriculture in Western Europe. Its impact extends to weather patterns, making it a key component of the region's climate system.