CLIMATE-CHANGEeeeeeeeeeeeeeeeeeeeeeeeee.pptx

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1. UNIT 6: CLIMATE CHANGE

2. What is climate change? Climate change refers to the statistically significant changes in climate for continuous period of time. Factors that contribute to climate change can be natural internal process, external forces, and persistent anthropogenic changes in the composition of the atmosphere or in land use

3. Human A ctivities CAUSES OF CLIMATE CHANGE Orbital Changes Pollution Volcanic Eruptions

4. Volcanic Eruptions When volcanoes erupt, it emits different natural aerosols like carbon dioxide, sulfur dioxides, salt crystals, volcanic ashes or dust, and even microorganisms like bacteria and viruses; Can cause a cooling effect to the lithosphere because its emitted aerosol can block a certain percentage of solar radiation ;

5. Pinta Island Tortoise POlar Bear Next Volcanoes located near the equator are more likely to cause global cooling because of the wind pattern Volcanoes located near to north or south poles are less likely to cause cooling

6. Orbital Changes Earth’s orbit can also cause climate change, this was proposed by the Milankovitch theory As the Earth travels through space around the Sun, cyclical variations in three elements of Earth-Sun geometry combine to produce variations in the amount of solar energy that reaches Earth

7. The three elements that have cyclic variations are: Eccentricity is a term used to describe the shape of Earth's orbit around the Sun. Obliquity is the variation of the tilt of Earth's axis away from the orbital plane. Precession is the change in orientation of Earth's rotational axis.

8. Human Activities The largest known contribution comes from the burning of fossil fuels, which releases carbon dioxide gas to the atmosphere; Human activities result in emissions of four principal greenhouse gases: Deforestation releases carbon dioxide and reduces its uptake by plants;

9. Next High methane emission is related to agriculture, natural gas distribution, and landfills; High nitrous oxide is also emitted by human activities such as fertilizer use and fossil fuel burning; Halocarbons released by human activities destroy ozone in the stratosphere and have caused the ozone hole over Antarctica.

10. Back Next Effects of Climate Change on Society It directly affects the basic elements of people’s lives like water, food, health, use of land, and the environment. Declining crop yields due to drought, especially in Africa, are likely to leave hundreds of millions without the ability to produce or purchase sufficient food. It will increase worldwide deaths from malnutrition and heat stress.

11. Back Next Ecosystems will be particularly vulnerable to climate change. Ocean edification will have major effects on marine ecosystems, with possible adverse consequences on fish stocks. - Melting or collapse of ice sheets would raise sea levels It will increase flood risks during the wet season and it will strongly reduce dry-season water supplies.

12. YouTube Link : https://youtu.be/AW4q0a2lfm8  https://youtu.be/z_DBYApc9m0

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