For Homework Set 8 you will use your Global Warming: Understanding the Forecast textbook and complete the problems listed below. Page 149 #1 #2 and #4 Page 188 #2 #3 and #4Submit your answers in a Word document to the Dropbox no later than Sunday 11:59 PM EST/EDT.Page 149 #1 What is a proxy measurement? Describe two types of proxy measurements.Page 149 #2 What is a climate forcing? Which ones are human in origin and which ones are natural?Page 149 #4 Why ideas the warming since 1970’s the smoking gun for a human impact on climate?Page 188 #2 Why is the discount rate an important factor in people’s view of the economics of avoiding climate change?Page 188 #3 How can danger limits for climate change be defined? What specific implications do they have for carbon emissions in the future?Page 188 #4 Which can provide more carbon emission reduction in the next few decades efficiency or alternative energy sources? What about to the year 2100?