给定一篇英语文章，找出其中的主题和主旨。输出找到的主题和主旨。
英语文章：Global warming is a major concern in today's world. Increased levels of carbon dioxide and other greenhouse gases trap heat in the atmosphere, causing temperatures to rise. This has led to melting glaciers and ice caps, rising sea levels, and unpredictable weather patterns.
主题：全球变暖

主旨：增加的二氧化碳和其他温室气体导致气温上升，导致冰川和冰帽融化，海平面上升，天气模式不可预测。