Global warming is mainly caused by human activities. The burning of fossil fuels like coal, oil, and gas releases carbon dioxide (CO2) into the atmosphere, which traps heat. Deforestation is another major cause, as trees absorb CO2, and when they are cut down, more CO2 remains in the air. Industrial processes and agriculture also contribute to the problem by releasing methane and other greenhouse gases. These activities increase the greenhouse effect, causing the Earth's temperature to rise, leading to climate changes such as melting ice caps, rising sea levels, and extreme weather events. Reducing pollution and protecting forests can help slow down global warming.