The following three recommended resources are international organizations that offer broad information on sustainability to assist organizations, businesses, governments and communities in being greener. Keeping your business updated with sustainable practices starts at being informed of what other companies and organizations are doing to minimize resource use. Each organization has good information on company examples and application to various industries.
The World Resources Institute is a think tank that gathers information on critical areas of environmental need throughout the world. Using this research to employ experts, volunteers and WRI members, the organization forms integral partnerships that work on sustainable projects throughout the world. The resources available to the general public include the ability to create Strategic Relationships and becoming a member of a Corporate Consultative Group.
More details on WRI collaborations are available here: http://www.wri.org/corporations
The Global Footprint Network provides cities, businesses and institutions with the ability to 
asses their ecological global footprint. The first step towards finding out your ecological footprint is to go to the “Footprint Basics” tab, which includes a wealth of information for different groups on how to assess their contribution to environmental degradation. This website relates your footprint to that of other nations and organizations in the world, contrasting the differences created by levels of consumption and affluence.
For more information on how partnering with The Global Footprint Network can benefit you, see this informational page for organizations and how to join. https://www.footprintnetwork.org/
The Network of Business Innovation and Sustainability is essentially a giant encyclopedia which links companies and organizations to all of the knowledge that they need to stay updated on the future of sustainability. Their network includes partners from governments, non-profits, individuals, professionals and even students. All of these people work together to teach, learn and innovate techniques and ideas about sustainability through events, workshops and discussions.
To see how your business matches up with other NBIS partners, see this page on current partnerships and events https://nbs.net/