The document discusses the greenhouse effect and global warming. It defines the greenhouse effect as an atmosphere containing gases that absorb and emit infrared radiation, trapping heat and warming the Earth's surface. It then explains the mechanisms by which sunlight and infrared energy are absorbed and reemitted by greenhouse gases like carbon dioxide, methane, and nitrous oxide. Increased concentrations of these gases from human activities are amplifying the greenhouse effect and causing global warming, with problems like rising sea levels and extreme weather. Solutions proposed to prevent further warming include transitioning to renewable energy sources, reforestation, and conserving energy.