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Global warming zagidullina_veselova Global warming zagidullina_veselova Presentation Transcript

  • Junona Veselova, Kristina Zagidullina “Zaliakalnio” gymnasium
  •  Global warming Whats Going to Happen? Natural and Amplified Warming Causes
  • refers to the current rise inthe average temperature of Earthsatmosphere and oceans and itsprojected continuation.
  •  Average temperatures have climbed 1.4 degrees Fahrenheit (0.8 degree Celsius) around the world since 1880. Average temperatures in Alaska, western Canada, and eastern Russia have risen at twice the global average.
  •  Glaciers and mountain snows are rapidly melting —for example, Montanas Glacier National Park now has only 27 glaciers, versus 150 in 1910.
  • South Cascade Glacier, Washington1928 1979 2003
  •  Coral reefs, which are highly sensitive to small changes in water temperature, suffered the worst bleaching—or die-off in response to stress—ever recorded in 1998, with some areas seeing bleach rates of 70 percent. percent
  •  An rise in the amount of extreme weather events, such as wildfires, heat waves, and strong tropical storms, is also attributed in part to climate change by some experts.
  •  Sea level could rise between 7 and 23 inches (18 to 59 centimeters) by centurys end. Some hundred million people live within 3 feet (1 meter) of mean sea level, and much of the worlds population is concentrated in vulnerable coastal cities.
  •  Glaciers around the world could melt, causing sea levels to rise while creating water shortages in regions dependent on runoff for fresh water. Strong hurricanes, droughts, heat waves, wildfires, and other natural disasters may become commonplace in many parts of the world.
  •  More than a million species face extinction from disappearing habitat, changing ecosystems, and acidifying oceans. The oceans circulation system, known as the ocean conveyor belt, could be permanently altered, causing a mini-ice age in Western Europe and other rapid changes.
  •  The greenhouse effect is a natural warming process. Carbon dioxide (CO2) and certain other gases are always present in the atmosphere. These gases create a warming effect that has some similarity to the warming inside a greenhouse, hence the name “greenhouse effect.”
  •  Increasing the amount of greenhouse gases intensifies the greenhouse effect. Higher concentrations of CO2 and other greenhouse gases trap more infrared energy in the atmosphere than occurs naturally. The additional heat further warms the atmosphere and Earth’s surface.
  • Sunlight brings energy into the climate system; most of it isabsorbed by the oceans and land.
  • Some of the infrared energy furtherTHE GREENHOUSE EFFECT : warms the Earth.Heat (infrared energy) radiates AMPLIFIED GREENHOUSEoutward from the warmed surface of EFFECT:the Earth. Higher concentrations of CO2 andSome of the infrared energy is other "greenhouse" gases trap moreabsorbed by greenhouse gases in infrared energy in the atmospherethe atmosphere, which re-emit the than occurs naturally. The additionalenergy in all directions. heat further warms the atmosphere and Earth’s surface.Some of the infrared energy isemitted into space.
  • Climate Is Changed byMany Processes
  •  CO2 and Other Greenhouse Gas Variations Human Activity and Greenhouse Gas Reducing Other Greenhouse Gases Ocean Circulation Volcanic Eruptions Solar Variations Orbital Variations Land Use Changes
  •  Factors that can amplify or reduce the effect of the causes of change are known as "feedbacks." Some of the key feedbacks are described in the following sections. These feedbacks consist of interconnected processes in which a change in one leads to a change in another, which ultimately leads to further changes in the first.
  •  Aerosols Clouds Water Vapor Ice-Reflectivity
  • Think again