The article by Douglas Arent, Alison Wise, and Rachel Gelman provides an excellent overview on the rapid development of the renewable energy sector. The article focuses on trends in renewable energy markets, the status and prospects of renewable energy technology (RET), and policy frameworks for RETs. It is more reticent on the role of renewable energy for combating global warming. This acknowledges the fact that a full assessment of the potential contribution of RETs requires an integrated systems perspective, including consideration of the climate change mitigation requirement and the status and prospects of alternative mitigation options ([Edenhofer et al., 2009], [Edenhofer et al., 2010] and [Clarke et al., 2009]). This comment will briefly review the article's perspective on the trends and prospects of renewable energy, and then move on to a short discussion of some system-level considerations for assessing the role of renewable energy for combating global warming.
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