128 www.gogreen-project.eu Extended Information Sheet Informative videos about the climate change and global warming https://www.nationalgeographic.org/video/climate-101-cause-and-effect/ https://climate.nasa.gov/climate_resources/139/video-global-warming-from-1880-to-2020/ https://youtu.be/8Rvl6z80baI Introduction to GHG What is the GHG (Greenhouse Gas) effect? The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases (i.e., greenhouse gases) in a planet's atmosphere radiate energy in all directions. Part of this radiation is directed towards the surface, thus warming it. The intensity of downward radiation – that is, the strength of the greenhouse effect – depends on the amount of greenhouse gases that the atmosphere contains. The temperature rises until the intensity of upward radiation from the surface, thus cooling it, balances the downward flow of energy. What is a GHG (Greenhouse Gas)? A greenhouse gas (GHG) is a gas that absorbs and emits radiant energy within the thermal infrared range, causing the greenhouse effect. The primary greenhouse gases (with their percentage contribution to the greenhouse effect) in Earth's atmosphere are: ✔ water vapor, 36–70% ✔ carbon dioxide, 9–26% ✔ methane, 4–9% ✔ ozone, 3–7% Without greenhouse gases, the average temperature of Earth's surface would be about −18 °C (0 °F) Why is it important? Climate change caused by excess greenhouse gases and a big carbon footprint can cause: • Heat waves that can damage crops and livestock. • Increased air pollution, linked to health problems. • Severe storms, flooding, higher sea levels and extreme weather • Loss of habitat as the climate changes
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