"The Day After Tomorrow"- Fact or Fiction?
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"The Day After Tomorrow"- Fact or Fiction?






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"The Day After Tomorrow"- Fact or Fiction? Presentation Transcript

  • 1. Fact or Fiction?Global Climate ChangeOcean – Air Interaction
  • 2. 1. What is an abrupt climatechange? Scientist believe if a certain temperature level is reached, there may be an abrupt and large change in the climate.
  • 3. 2. Could an abrupt climate changereally happen? Yes, scientist believe change that occurs over decades, rather than centuries.
  • 4. 3. What is the difference between“global warming” and “climatechange?” "Global warming" refers to the gradual increase of the Earths average surface temperature, due to a build-up of greenhouse gases in the atmosphere. "Climate change" is a broader term that refers to long-term changes in climate, including average temperature and precipitation, as well as changes in the seasonal or geographic variability of temperature and precipitation.
  • 5. 4. Should we worry about globalwarming? Yes, Global temperatures have increased by 1°F over the past 100 years. Although this may seem like a small change, it is enough to harm important ecosystems, change rainfall patterns and raise the sea level. Climate models project additional warming of about 2- 10° F over the next 100 years.
  • 6. 5. Do scientists agree about globalwarming? Although scientists still argue about how fast and how much the atmosphere will warm, the mainstream scientific community agrees on three key points: the earth is warming; the warming is caused primarily by the build-up of GHGs in the atmosphere; and that the warming will continue if we don’t reduce GHG emissions.
  • 7. 6. What is the Atlanticthermohaline circulation? The Atlantic thermohaline circulation, which includes the Gulf Stream, acts like an oceanic conveyer belt that carries heat from the tropics to the North Atlantic region. Warm surface water from the tropics travels northward by the Gulf Stream. As the warm water cools in the North Atlantic, it sinks to the ocean floor, and then slowly moves southward until it returns once again to the tropics. This ocean circulation pattern is caused by differences in water temperature and salinity in the ocean.
  • 8. 7. What are the chances of thethermohaline circulation shuttingdown? We don’t yet know the probability of the thermohaline circulation shutting down. It depends on how much and how quickly the atmosphere warms. In general, it is considered possible but not very likely. If it were to occur, it would probably not happen within the next 100 years, and circulation would eventually recover, after decades or centuries.
  • 9. 8. How can global warming causecold weather? Without the thermohaline circulation, not as much heat would be transported from the tropics to the North Atlantic region.
  • 10. 9. If “The Day After Tomorrow” isfiction, what is the truth aboutglobal warming? The truth is that global warming is happening and that it is already too late to avoid some of the effects. Even under the most optimistic circumstances, atmospheric scientists expect global climate change to result in increased flooding and droughts, more severe storms, and a loss of plant and animal species. These events will occur, even if climate change is gradual.
  • 11. 10. What can be done aboutglobal climate change? Most experts believe that technology will provide the solutions. Technologies that reduce emissions (energy efficiency, hydrogen fuels, carbon storage, nuclear energy and renewable energy) and technologies that remove carbon from the atmosphere may all play a role. Government policies that encourage businesses to develop and use these and other technologies are also very important.