The leading cause of climate change is the increase in greenhouse gases in the atmosphere, primarily due to human activities. Fossil fuel combustion for energy, deforestation, and agricultural practices significantly contribute to the release of carbon dioxide, methane, and nitrous oxide. These gases trap heat in the atmosphere, leading to global warming and resulting climatic changes. The effects include rising sea levels, extreme weather events, and altered precipitation patterns, posing risks to ecosystems, human health, and food security. Addressing climate change requires global cooperation to reduce emissions, transition to renewable energy sources, and implement sustainable practices to mitigate its impacts.