The rhetorical thinking, English homework help

Read the following chapters (on myCourses) in this order:

 Plan B (2003)

 Plan B 2.0 (2006)

Plan B 3.0 (2008)

Plan B 4.0 (2009)

WOTE Preface and Ch. 1 (2011)

Write #2: As the Plan B versions (2.0, 3.0, 4.0) suggest, the sequence of chapters is a series of updates. 

How does Lester Brown move his message from the first Plan B up through 4.0? 

What changes from version to version? What are the issues? What are the urgencies?

 Pay attention to the dates of publication, too. 

Do the chapters reflect a shift in circumstances from 2003 to 2009, and if so, how? 

And then: why does Brown publish World on the Edge (WOTE) instead of Plan B 5.0? Has something significant happened between 2009 and 2011 to trigger a turn away from “Plan B” toward something else? Please be specific.

Please answer the question above after reading these Attachment below. The response should be no more less then 200 and no more then 300 words. 

20160201195034plan_b_ch01_2003__18_pp_.pdf 

20160201195039plan_b_2.0_ch01_2006__16_.pdf 

20160201195043plan_b_3.0_ch01_2008__23_pp_.pdf 

20160201195047plan_b_4.0_ch01_2009__27_pp_.pdf 

20160201195052wotebook.pdf 

20160201195034plan_b_ch01_2003__18_pp_.pdf