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Global warming

Global warming. MEMBERS LIST. 4A LAU SIN YIN 4B CHOW HAU YI 4D LAU YAN YU SHUM KING SUN. Today, we are going to explain the most ignored but serious global environmental problem – Global warming.

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Global warming

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  1. Global warming

  2. MEMBERS LIST 4A • LAU SIN YIN 4B • CHOW HAU YI 4D • LAU YAN YU • SHUM KING SUN

  3. Today, we are going to explain the most ignored but serious global environmental problem – Global warming. Environmental problems are becoming more and more serious in the world, and yet, humans are still neglecting its significance. Or, maybe we can’tblame humans if we don’t know much about what is happening around us. Preface

  4. What is global warming? • Global warming refers to the increase in the average temperature of the Earth and changes in the amount and pattern of precipitation. • Global average near-surface atmospheric temperature rose 0.6 ± 0.2 °C in the 20th century. The prevailing scientific opinion on climate change is that most of the warming observed over the last 50 years is attributable to human activities.

  5. Why global warming has become a major environmental issue all over the world? • on a year to year,month to month,and day to day scale,a change in air temperature of a few degrees may not be very significant. • But an increase in global temperatures is expected to cause other changes, including weather, sea level and ecosystem,increased intensity of extreme weather events,and changes in the amount and pattern of precipitation. Other effects of global warming include changes in agricultural yields, glacier retreat, species extinctions and increases in the ranges of disease vectors.This is why global warming has become a major environmental issue all over the world.

  6. 1000s to 2000s , > Reconstructed temperature change < 1880s to 2000s, Global Temperatures changes

  7. The process of Global warming

  8. The Process • All of us know the activity that’s increasing the speed of Global Warming is called greenhouse effect. • But DO YOU KNOW HOW IT’S WORK??

  9. How does Greenhouse effect work? • The greenhouse effect is the process by which absorption and emission of infrared radiation by gases in the atmosphere warm a planet 's lower atmosphere and surface.

  10. Cause of Global Warming

  11. The Most Significant Cause ~Human • The Earth has cycled many years of warming and cooling over the billions of years but it’s increasing faster than ever and can’t be explained with natural processes. • Clearly, humans are chief offender . • We are accelerating the natural climatological cycles with our human-created emissions of greenhouse gases .

  12. What have human done?

  13. CONSEQUENCES 1.Rising sea levels As the earth gets warmer , the snow and ice cover will melt , meltwater would run into the ocean .The thermal expansion of seawater will lead to a rise in sea level. 2.Change in climate-more frequent extreme climate events -precipitation patterns -climate regions 3.Change in world ecosystem-desertification -extinction of species -bleaching of coral

  14. CONSEQUENCES AFFECT US 1.Health riskClimate change will alter the distribution pattern of parasites , bacteria and carriers of infectious diseases .Hotter summers will lead to more cases of heat-related health problems.2.Coastal floodingBring disaster to billions of people living in coastal areas and low-lying countries.3.Agriculture and food supplyA warmer climate would lead to a loss of soil moisture because of a higher evaporation rate.4.Freshwater supplyHigher evaporation rate may lead to shortage of freshwater supply.

  15. The solution of global warming

  16. A) Signing and ratifying Kyoto Protocol B) Adopting the Bail Roadmap a) Engaging in a large-scale afforestation International Cooperation COUNTRIES

  17. COUNTRIES b) Reduce greenhouse gas emissions • -replacing fossil fuels with renewable power resources • -use cleaner fuels • -improving energy efficiency • -improving transport systems • -recycling waste • -raising public awareness through education

  18. COUNTRIES c) Developing in a sustainable way • control population growth • farm in a sustainable way • develop technologies that are friendly • develop our cities in a way that the emission of greenhouse gases can be kept as low as possible

  19. Individual effort • At home: • -Take shorter showers • -change tungsten light bulbs to fluorescent bulbs • -grow more plants • -set the air conditioning temperature at 25℃or higher • -Open windows to get fresh air instead of turning on the air conditional • -switch off electrical appliances rather than leave on standby

  20. Individual effort Shopping • -bring your own bag • -run washing machine with full load • -buy recyclable products • -choose energy-efficient products • -reduce the amount of packaging

  21. Individual effort • Transport and travel • -use mass transit systems • -take fewer flights • -more cycling and walking • Others • -take stairs instead of elevators • -eat less meat • -consume locally produced and seasonal food

  22. Difficulties encountered • a) Different viewpoints of countries • -it is unfair as less developed countries were not required to take any responsibility to control their emission • -only the more developed countries control their emission will not help ease the problem • b) Their countries will be affected • -Tight emission control sets in the Kyoto Protocol will hinder the economy • -meeting the emission target incurred extra costs

  23. The End Thanks for listening

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