http://earthsky.org/earth/on-earth-day-behold-the-human-footprint A Clear Voice for Science Thu, 24 May 2012 17:44:15 +0000 hourly 1 http://wordpress.org/?v=3.3.2 http://earthsky.org/earth/on-earth-day-behold-the-human-footprint/comment-page-1#comment-198037 Captain Jack Wed, 03 Nov 2010 07:03:14 +0000 http://earthsky.org/?p=48212#comment-198037 Because of that, in cases where you are touching a sensitive or controversial topic, it is still best to exercise prudence and precaution Because of that, in cases where you are touching a sensitive or controversial topic, it is still best to exercise prudence and precaution

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