高英选二经典课件U5Macquarie Island from Chaos to Conservation.pptx

高英选二U5Macquarie Island from Chaos to Conservation2023/5/24 2023/5/24 Watch the video and answer the questions.Are humans part of Earth’s ecosystems? why? 2. In what ways can humans affect ecosystems? Humans can affect ecosystems in positive and negative ways. For example, to have a positive influence on ecosystems, people can plant trees, feed and protect animals, recycle things, etc. However, deforestation, air and water pollution and excessive waste affect ecosystems in a negative way.Yes. Humans are part of Earth’s ecosystems. Because all the living things live in ecosystems and people are living things.Starting out 2023/5/24 Look at the satellite images and answer the questions.What is happening to the area according to the satellite images?What do you think a later satellite image would show?Aral Sea is becoming smaller and smaller / shrinking.3.What do you think caused these changes?2023/5/24 The Aral Sea CrisisThe Aral Sea is situated in Central Asia, between Kazakhstan to the north and Uzbekistan to the south. It was once the world`s fourth largest lake, and contained 10 grammes of salt per litre.The rivers flowing into the Aral Sea are the river Syr Darya from the north and the river Amu Darya from the south. In the 1960s , the two rivers were diverted away from the Aral Sea so that people could irrigate the surrounding desert region and focus on cotton production. As a result, the Aral Sea has been decreasing in size, and by 1997, it had shrunk to a tenth of its original size, splitting into four lakes. By 2009, the south-eastern lake had disappeared altogether, and the south-western lake had been reduced to a thin strip, with a salinity level of more than 110 grammes per litre.2023/5/24 This shrinking of the Aral Sea became known as “one of the planet`s worst environmental disasters”; the decline of the once-thriving fishing industry brings unemployment and economic hardship to the surrounding region.2023/5/24 Aral Sea`s return is possible