"Green cement: Concrete solutions": concrete technologies *already on the market* have enormous conservation potential User claird, in the /r/Energy: News & Discussion subreddit, 02 Apr 2013
Green cement: Concrete solutions -- Cement manufacturing is a major source of greenhouse gases. But cutting emissions means mastering one of the most complex materials known. User evolvesustain, in the EvolveSustain: News and innovations in global sustainability and cultural development. subreddit, 25 Feb 2013
Green cement: Concrete solutions -- Cement manufacturing is a major source of greenhouse gases. But cutting emissions means mastering one of the most complex materials known. User davidreiss666, in the Green subreddit, 25 Feb 2013
Green cement: Cement manufacturing is a major source of greenhouse gases. But cutting emissions means mastering one of the most complex materials known User NGC300, in the Soft Science subreddit, 22 Feb 2013
Green cement: Concrete solutions -- Cement manufacturing is a major source of greenhouse gases. But cutting emissions means mastering one of the most complex materials known. User ServerGeek, in the Environment subreddit, 21 Feb 2013