introduction: add final signposting para

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@@ -71,4 +71,14 @@ professional middle-class Western political movement which emerged in the 1960s
 to protect 'nature' against the encroachment of 'civilisation', and which has
 now adopted climate change as a 'master frame' for its issues.
 
-In this rest of this dissertation, I will \[TODO\]
+In recent decades, many of the most important political demands of the green
+movement have not been realised, and many scholars have supposed that green
+rhetoric is not fulfilling its proper function of delivering change. In this
+rest of this dissertation, I will first explore why it might be that green
+rhetoric is failing to deliver political change, before exploring in more detail
+one particular allegation: green rhetoric isn't working because it is too
+apocalyptic. I will argue that this diagnosis is unhelpful and untrue. In
+contrast, I will argue not only that green rhetors must continue to use
+apocalyptic end-of-the-world language, but that they must draw deeper on other
+aspects of apocalyptic language which have been heretofore neglected by green
+rhetors, if they are to play their proper part in delivering political change.