NEWSWEEK named its 2010 Green Rankings. Insurers are among the 500 largest publicly traded U.S. companies the media outlet included. It measured revenue, market capitalization and number of employees. Then each company was given a score based on more than 700 metrics, including greenhouse-gas emissions, water use and solid-waste disposal.

Many insurers made the top half of the list:

27. Travelers

49. MetLife

64. ACE

70. Allstate

78. Marsh & McLennan

88. Prudential Financial

89. Genworth Financial

97. XL Group

112. Chubb

153. Hartford Financial Services Group

159. Principal Financial Group

167. Aflac

171. Progressive

175. Aon

179. Unum Group



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