Trade associations are great for learning about the current trends and concerns in an industry. Find associations to track in the reference section at the end of the S&P Industry Surveys (available via S&P's NetAdvantage).
Sample Trade Associations
There are a number of publications geared towards specific topics in sustainability. Some will be heavily academic while others are more business orientated.
Resources related to environmental sustainability, for example Wind Energy, may be very technical and a scientific background is helpful for understanding them.
Many publications related to social sustainability are produced by governments, non-governmental organizations (NGO), and academia such as the ESR review.
Articles on corporate governance can be found via the databases below: