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About Us

Investing in sustainability

Third Line Group integrates strategy, needs and solutions to identify sustainable investments in growth market regions.



Third Line Group gets its name from the notion of the triple bottom line, which refers to economic, social and environmental prosperity. 


This ethos underlines Third Line Group, which integrates strategy, audits, and ISO 20121 implementation to identify sustainable investments in growth market regions.


Third Line Group has significant holdings in: 
  Hetherington Sustainability

  Carbon Calculated


Corporate Sustainability Strategy


Benefits beyond compliance.


Move your business from compliant sustainability reporting to sustainability leadership by identifying risks and opportunities from non-financial issues such as climate change, labour relations and social reputation.


South African sustainability strategist Alex Hetherington founded Hetherington Sustainability in 2004. The core services of the company centre on proving the bottom-line business case of sustainability by identifying efficiencies in companies that ultimately result in financial profitability to the business, benefit to its social stakeholders and minimised impact on the environment.


We've  helped these clients move towards sustainability leadership: WWF-South Africa, Nedbank, Sanlam, Santam, Investec and Bidcorp.




Carbon Management Consultancy
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Measure | Verify | Manage

Carbon Calculated, established in 2007, is a leading carbon measurement and reporting company with a proud list of long-term clients that underpins the company’s belief in supporting businesses to better understand, manage and, ultimately, reduce their carbon emissions.


In addition to carbon footprint services, Carbon Calculated also offers independent third-party verification services, CDP reporting services and various software solutions that help clients measure and report their greenhouse gas implications.


Clients: Vodacom, Woolworths, Mediclinic, Nampak, Virgin Active.




Sustainable Event Specialist


With TonneZero, ISO 20121 ensures the benchmark for international sustainable events.


TonneZero, founded in 2017 and the latest offering in the Third Line Group stable, is a dedicated company bringing sustainability management systems to the event industry. At the heart of these services is the implementation of the ISO20121 management system that was pioneered at the London 2012 Olympic Games, and has been adopted as the benchmark for international recognition of sustainable events. 


Other partners in the business include environmental legal and systems company, EcoImpact, and carbon measurement company, Carbon Calculated.







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"Sustainability makes incredible business sense.
After we pull the data together, it's fantastic to reach a clear direction — one that's smart for the client and smart for the environment." 
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Sustainability Strategist

Based in Cape Town, Alex has extensive experience helping large institutions to conduct climate change risk and opportunity analyses. 
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