Global warming results primarily from human activities that release heat-trapping gases and particles into the air. The most important causes include the burning of fossil fuels such as coal, gas, and oil, and deforestation.

• 全球变暖主要是由人类活动引起的，人类活动会向空气中释放吸热气体和粒子。其中最重要的因素包括像煤、天然气和石油等化石燃料的使用和森林的砍伐。