• Nasa-funded Study: Industrial Civilisation Headed For 'Irreversible Collapse'. http://www.theguardian.com/environment/earth-insight/2014/mar/14/nasa-civilisation-irreversible-collapse-study-scientists 42 comments 19/3/2014 worldnews
• NASA-funded study: industrial civilisation headed for 'irreversible collapse'? http://www.theguardian.com/environment/earth-insight/2014/mar/14/nasa-civilisation-irreversible-collapse-study-scientists 9 comments 14/3/2014 politics
• NASA-funded study: industrial civilisation headed for 'irreversible collapse'? http://www.theguardian.com/environment/earth-insight/2014/mar/14/nasa-civilisation-irreversible-collapse-study-scientists 11 comments 14/3/2014 science