温室效应是指大气中的某些气体，如二氧化碳、甲烷和水蒸气等，能够吸收和再辐射地球表面向外散发的热量，使得地球表面的平均温度比理论上的温度高，这种现象被称为温室效应。温室效应是地球气候变化的重要原因之一，也是人类活动所导致的全球变暖现象的主要驱动因素。

英文翻译：

The greenhouse effect refers to the phenomenon where certain gases, such as carbon dioxide, methane, and water vapor in the atmosphere, can absorb and re-radiate the heat emitted by the Earth's surface, resulting in the Earth's surface temperature being higher than it would be in the absence of these gases. The greenhouse effect is a significant cause of climate change and a major driving force behind global warming caused by human activities.