Climate change refers to long-term shifts in temperature and weather patterns on Earth. It is primarily caused by human activities, such as the burning of fossil fuels and deforestation, which release greenhouse gases into the atmosphere. These gases trap heat, leading to a gradual increase in global temperatures and resulting in various impacts, including rising sea levels, extreme weather events, and ecosystem disruptions. Efforts to mitigate climate change involve reducing greenhouse gas emissions and transitioning to renewable energy sources.