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Climate change

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Transcript

  • 1. BY: NISHITA BANERJEE VI C
  • 2. WHAT IS CLIMATE? • Climate is the general weather conditions of a place. • It is the pattern of variation in temperature, humidity, atmospheric pressure, wind, precipitation etc.
  • 3. • Climate of the world is changing at a rapid speed. • Changes in climate can be: changes in average temperature changes in rainfall patterns changes in humidity level of a place.
  • 4. CHANGING CLIMATES HAVE CHANGED LANDSCAPES ARAVALLI HILL FORESTS, INDIA
  • 5. CHANGES IN THE FOLLOWING CAUSE CLIMATE CHANGE: CHANGE • Sun’s output • Earth’s orbit • Drifting continents • Volcanic eruptions • Greenhouse gases
  • 6. SOLAR OUTPUT CAUSES ONLY MINOR CHANGES IN EARTH’S TEMPERATURES.
  • 7. • In the distant past, these made a big difference in climate over millions of years by : changing ice caps at the poles altering ocean currents, which transport heat and cold .
  • 8. CONTINENTAL DRIFT
  • 9. Huge volcanic eruptions can cool Earth by injecting ash and tiny particles into the stratosphere
  • 10. COOLING EFFECT AFTER VOLCANIC ERUPTION
  • 11. BUT THE MOST SIGNIFICANT FACTOR FOR CLIMATE CHANGE ARE
  • 12. GREENHOUSE GASES ARE:
  • 13. FACTORY SMOKE FOREST FIRES VEHICLE EXHAUST OIL REFINERIES
  • 14. GREENHOUSE GASES CAUSE
  • 15. GREENHOUSE EFFECT • Greenhouse gases like CO2 and H2O form a blanket above the earth surface. • They trap the solar heat. • This leads to warming of the atmosphere.
  • 16. This leads to : • More drought • more flooding • less ice and snow • extreme weather • rising sea level
  • 17. FLOODS DROUGHT EXTREME WEATHER AND NATURAL CALAMITIES DUE TO GLOBAL WARMING POLAR MELTDOWN SEVERE SNOWFALL
  • 18. GLOBAL WARMING CAUSES MELTING GLACIERS AND RISING SEA LEVELS
  • 19. CYCLE TO REDUCE YOUR CARBON FOOTPRINT
  • 20. BUT MAN’S GREED HAS ROBBED THE MOTHER EARTH OF ITS BEAUTY AND BOUNTY. WE HAVE TO STOP THIS MAYHEM BEFORE ITS TOO LATE.
  • 21. - MAHATMA GANDHI.