This lesson is all about the purpose or reason for recycling回收. Its all about ways in which we can use natural resources/materials again and again. Its about the many products which are found on the earth some of which once used will never return.Question? When did we first start to recycle?Recycling has been a common practice for about 2500 years.It became much more modernized in the 19th and 20th centuriesIn the 21st century it has now become a way of life all over the world including many developing countries Did you know that: The world is full of two main products which are formed either naturally or are man made. What are they?Renewable可更新的such as: Glass metal(steel) paper, plastic and non renewable不可更新 such: Natural gas, crude oil原油coalExercise: Try to give me some definitions定义 or explanations of recycling:1)Using natural or manmade products again and again.2)Turning old products into new ones3)Utilizing利用 (using) mainly old products from the earth which can be used many times.4) Recycling is a process (method) of using old materials (waste) into new products to prevent wasting potentially 潜在地useful materials. 5) Reduce the continued consumption 消费 (using)of fresh or raw materials 新鲜的原料Exercise: Give me reasons why we need to recycle?1) Increasing global population. 2) Need for modernization and technology. 3) The need to produce more food. 4) Because of deforestation森林开伐: cutting down trees for: a) Timber/wood b)making houses, c)furniture d)paper e)furniture, f)firewood/cooking. 5)Killing animals for food, skins, oil, furs.6) To preserve (keep) what is left of the natural resources for generations to come: for example, Trees, plants, animals, forests, birds, fresh water, 7) So that we dont destroy the planet or the world in which we live. 8) So that we can protect our natural habitat自 然栖息地 9) So that our children can still walk in the forests and see the animals and plant life in 100 to 200 years time.10) Because there is a heavy demand for clothes, textiles, transportation, medicine, education, industry, exploration. 11) Because time is running out for healthy living. 12) The world is becoming much more modern and faster. 13) Because we are depleting消耗 our natural resources. 14) Because we are burning fossil fuels化石燃 料.Did you know: From 1900 to 2000 most or many of the raw or natural products that we used on a daily basis no longer exists or is in great danger of running out until we urgently do something about it: This is particular about the number/quantity of trees, animals, plant life and fresh water.Exercise: Please try to name some of the many products we use in todays world.water paper wood plastic Gas Coal fabric (textiles) stone air/gases electronicsRubber橡胶(tires) Leatherchemicals化学药品 Crude oil cooking or natural oil animals Batteries (lithium锂/Duracell金霸王) glass Precious or valuable stones or metalsSkins, bones, meat from animals. Exercise: Can you name some of the metals which are used in todays world:1) Stainless Steel不锈钢 2)Iron熨斗 3) Copper铜 4) Brass黄铜 5) Aluminium 6) Nickel镍 7) Uranium铀 8) Platinum白金 9) Gold 10) Silver11) Silver 12) Bronze青铜 13) Zinc锌 14) Magnesium镁 15) Titanium钛 16) Mercury水银, 17) Lead领头位置Exercise: now give me a list of natural or man made of Acids/Chemicals we use today.1) Sulphuric Acid硫酸 2) Nitric acid硝酸 3) Hydrochloric acid盐酸 4) Ascorbic acid抗坏血酸 (vitamin C) 5) Amino acids胺酸(produced by the body)Exercise: Now give me a list of some of the gases which are used today1) Oxygen氧 2) Hydrogen氢(also can be liquid hydrogen液体氢used for rockets and spaceships) 丙烷 3) Nitrogen 氮 4) Propane (used for cookers) 5) Helium气体 6) Acetylene gas乙炔气 (used for welding焊接法/fixing metals)6) Butane gas丁烷气(used for cigarette lighters and smaller cookers)Now gives a list of some fuels which come from crude oil1) Gasoline汽油(gas) /petrol 2) Benzene苯 3) Diesel柴油 4) Lubricating oil润滑油WD40. 5) Unleaded petrol无铅汽油Now give me a list of some fabrics 纤维织物(textiles).1) Cotton 2) Nylon尼龙 3) Polyester聚酯 4) Rayon人造丝 5)Wool 6) Leather 7) Synthetic leather合成皮带 8) Cashmere开士米 9) Fur 10) Corduroy灯芯绒11) Mink貂 12)Suede绒面革Can you name some cooking oils or salad oils that we use:1) Sesame oil麻油, used mainly for cooking 2) Coconut oil椰子油used mainly in baking cakes 3) Corn oil玉米油for frying 4) Olive oil橄榄油used mainly for salads 5) Cod-liver oil鱼肝油 (used mainly when you are ill) 6)Sunflower oil向日葵油for cooking 7) Soybean oil豆油for saladsExercise: Name some of the most common products we use in recycling today?1) Paper 2) Metals 3) Plastic 4)Wood 5) Water 6) Chemicals 7) Batteries 8) Textiles Exercise: please look to the next ppt.