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Businesses, unlike governments, are uniquely positioned to move fast to reduce greenhouse gas emissions—especially when they partner with other businesses that share their commitment to sustainability. Environmental policies can take years, sometimes decades, to come into force. For example, countries signing onto the Paris Agreement have pledged to reduce carbon emissions by 2025, 2030, or later.

But when businesses make sustainability a top priority, they can have a dramatic impact throughout their network of suppliers, partners, and clients. Here’s how: link sustainable businesses in “circular economies” that spread sustainable practices across industries.

The Concept: Cycling Profits Among Sustainable Businesses

Mark Esposito, professor of business and economics at Harvard University and the Grenoble School of Management, defines the circular economy as a “no-waste industrial chain that promotes economic growth using the least amount of non-renewable natural resources as possible.” To give you an example, Levi Strauss & Co is currently working to implement its own no-waste chain by manufacturing jeans from recycled textiles, a process which requires significantly less water than making jeans from new cotton. The company now accepts textiles for recycling in all of its stores and aims to implement a closed loop recycling-to-manufacturing system by 2020.

This same no-waste concept can also be applied to everyday business transactions. In an ideal setting, every dollar an environmentally conscious business spent would become the earnings of another sustainable business, and that business’s expenditures would funnel into the profits of yet another sustainable business, and so on. In more concrete terms, an apparel retailer would source its offerings from suppliers committed to sustainability. Those suppliers, in turn, would purchase clothing from manufacturers using sustainable textiles. You get the idea.

The Challenge: Vetting the Sustainable Supply Chain

In the real world, circular economies centered around sustainability are easier said than done, and one of the biggest challenges is vetting. Today’s supply chains are more convoluted than ever, with 54% of manufacturers reporting no visibility into the sustainability of their suppliers.

Vetting partners and suppliers can be a huge undertaking. Having researched nearly 40,000 products sold at his virtual storefront, TheGreenOffice.com, sustainability consultant Alex Szabo speaks from experience when he says that vetting suppliers and potential partners is a central challenge for any business looking to create its own sustainable ecosystem. “It can take months to vet a new vendor,” Alex said. “It’s the added time-cost of sustainability.”

Sustainability Certifications: It’s Not Too Much Too Ask

Third-party certifications like TSC, Fair Trade, the Marine Stewardship Council, Green America, and the B Impact Assessment Score make it easier for businesses to identify sustainable businesses to partner with and buy from. Take Stephanie Meade, director of culture and marketing at San Francisco-based New Resource Bank. Stephanie asks all loan applicants to complete the B Impact Assessment to help her determine their social and environmental performance. “The crucial thing for us is their commitment to improving their sustainability,” Stephanie said.

What if you love your current supplier, or you are really excited about a potential new client, but they are not third-party certified? Talk to them. Carolyn McMaster, co-founder and principal of Thinkshift Communications, has pledged to work only with “do-gooder” businesses. She talks sustainability with all potential clients and refuses to work with any business with a questionable track record.

The decision to work exclusively with sustainable businesses involved some tough decisions–including firing one of her biggest and earliest clients. “We were their agency of record for four years, and we had a wonderful relationship with them,” Carolyn said. After many conversations, it became clear that the client would not make sustainability a priority in the foreseeable future. Carolyn took a stand and parted ways. “Cutting ties made things super lean for a while for us, but it was freeing,” she concluded.

Who’s Not on Board Yet?

Talking to your partners, clients, and suppliers can also help sustainable business practices spread. Ryan Honeyman, sustainability consultant and author of the B Corp Handbook, points out that certain industries such as real estate leave holes in what could otherwise be sustainable circular economies. In spite of these holes, Ryan believes there is simply too much social and environmental pressure for businesses in all industries to not adopt sustainable practices. Citing Nike and Walmart’s attendance at COP21, he added, “It’s inevitable that sustainable business practices will spread to other industries. It’s just a matter of time.”

Lauren Mobertz

Lauren is a researcher, writer, and coffee drinker examining the link between organizational policies and outcomes like employee engagement. You can follow her current project at workcanbehappy.com/hiring and find her past work at stories.workcanbehappy.com.