The document discusses the greenhouse effect, including: 1) Its history, dating back to 1896 when Swedish scientist Svante Arrhenius first proposed that increased CO2 emissions from burning fossil fuels could cause global warming. 2) The main causes of the greenhouse effect are emissions of gases like CO2, methane, nitrous oxide, and ozone from activities like deforestation, burning fossil fuels, industry, and transportation. 3) The consequences of the greenhouse effect include rising sea levels, climate changes worldwide, and increased health issues. Ways to reduce the effect include using less energy, planting trees, and reducing emissions.