The major process through which climate change is occurring is the increase of greenhouse gases in the atmosphere, primarily due to human activities such as burning fossil fuels, deforestation, and industrial processes. These gases, including carbon dioxide (CO2) and methane (CH4), trap heat from the sun, leading to a gradual rise in Earth's temperatures. The resulting changes in temperature patterns disrupt ecosystems, influence weather events, and cause rising sea levels, which pose significant threats to biodiversity and human societies.