Thesis advisor: Juliet B. SchorA key emergent issue in debates over how to respond to climate change is whether wealthy countries can continue to pursue endless economic growth and still meet emissions targets called for by scientists. This study examines how and why ideas of sufficiency--which emphasize the need to limit production and consumption growth--have emerged in this context, despite great obstacles in growth-oriented societies more favourable to "business-as-usual" or ecological modernization ("green growth") approaches. These issues are examined through a comparative case study of the United Kingdom and Canada--the former one of the most successful nations to date in reducing its greenhouse-gas (GHG) emissions and the latter one...