A business case to study. Here is one good example that is both sustainable and climate change-friendly from Willmott Dixon Group. See links for info,
http://www.willmottdixongroup.co.uk/sustainability
(Sustainability – Willmott Dixon Group)
http://www.willmottdixongroup.co.uk/sustainability/energy-and-climate-change
(Planning for energy efficiency and carbon emission reduction)
http://www.willmottdixongroup.co.uk/videos/sunesis-school
(Learning for the future)
http://www.willmottdixongroup.co.uk/sustainability/energy-and-climate-change/travel
(Green travel policy)
http://www.fmjdata.com/2013/02/08/procuring-to-protect-the-local-community/
http://www.willmottdixongroup.co.uk/news?actv_news_news_id=240&actv_news_news_page=1
(Protecting the local community with environmental benefits)
https://twitter.com/WillmottDixon/status/299907141127532545/photo/1
(One of their twitter examples)