5 The s tabilization scenarios are designed to stabilize atmospheric

5 the s tabilization scenarios are designed to

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approximately business-as-usual (RCP 8.5); The s tabilization scenarios are designed to stabilize atmospheric concentrations at a particular level. The lower the desired stabilization level, the lower and sooner the peak in emissions must be. To stabilize below twice the pre-industrial levels, emissions must be brought to a peak within the next few decades and rapidly brought down by the end of the century, falling below 1990 levels by mid-century. To stabilize below 450 ppm, levels must be brought to a peak within the next decade, and brought down to 80% below 1990 levels by mid-century; An increasingly widely used approach to defining the required carbon emissions reductions is the Wedge approach. This approach involves freezing emissions at current rates by offsetting projected business-as-usual emissions over the next 50 years (roughly 7 gigatons), envisioned, e.g., as 7 strategies for 1 gigaton carbon emission reductions. After 50 years, emission rates are brought down, but how abruptly and rapidly depends on the stabilization targets desired. Additional wedges can be used to achieve lower stabilization targets by bringing down, rather than freezing, annual carbon emission rates over the next 50 years. Reminder - Complete all of the lesson tasks! You have finished Lesson 6. Double-check the list of requirements on the first page of this lesson to make sure you have completed all of the activities listed there before beginning the next lesson. Page | 25
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  • Fall '19
  • Greenhouse gas

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