After years of being treated as a communications function, sustainability leadership is earning genuine executive authority. We spoke with 12 CSOs about what changed, and what still needs to.
Key Takeaways
For much of the past decade, the Chief Sustainability Officer role existed in a peculiar institutional limbo. Titles were generous; authority was not. Sustainability leaders were frequently housed under communications or legal, tasked with producing glossy annual reports and managing reputational risk, rarely invited to the rooms where capital was actually allocated. That picture, slowly and unevenly, is changing.
A new analysis by sustainability advisory firm Acre Resources, published in April 2026, found that 41% of Fortune 500 companies now have a CSO who reports directly to the CEO, compared with just 19% five years ago. The shift is not cosmetic. At companies including Unilever, Microsoft, and Schneider Electric, sustainability leaders now sit on executive committees with formal voting rights on capital expenditure, product strategy, and M&A screening. The structural elevation reflects a broader reckoning: ESG is no longer a reputational overlay but a financial, regulatory, and operational discipline with direct consequences for enterprise value.
Three forces converged to push sustainability leadership up the organisational chart. First, the EU Corporate Sustainability Reporting Directive, which entered full force for large listed companies in 2025, imposed double materiality assessments and mandatory third-party assurance on sustainability disclosures. Companies discovered they could not produce credible, auditable reports without sustainability leadership having real access to operational and financial data. Second, institutional investors escalated expectations. BlackRock, Vanguard, and State Street collectively engaged with more than 2,400 companies on sustainability governance in 2025, with board composition and executive accountability as lead themes. Third, physical climate risk began appearing in earnings calls as a genuine cost driver, from supply chain disruption to asset impairment, making the business case for proactive sustainability leadership harder to dismiss.
"The inflection point for me was when our CFO started asking me to co-present climate scenario analysis to the audit committee," said Priya Mehta, CSO at a FTSE 100 consumer goods company, speaking on background. "That was the moment I knew the role had genuinely changed. It was no longer about narrative; it was about numbers."
"Sustainability used to be the department that told a good story about what other departments did. Now we own outcomes. That is a fundamental shift in accountability, and it changes everything about how you staff, how you measure, and how you argue for resources."
Laura Fielding, Chief Sustainability Officer, Veolia North America
Across the 12 CSOs interviewed for this piece, a clear pattern emerged distinguishing those with genuine strategic influence from those still operating as sophisticated communicators. The most empowered leaders shared three structural characteristics. First, they held a standing seat at capital allocation or investment committee meetings, giving them the ability to shape project selection criteria before budgets were committed. Second, they had direct and regular access to the board's sustainability or audit committee, not filtered through the CEO or CFO. Third, they exercised formal authority over business unit sustainability targets, meaning unit leaders could not revise or abandon commitments without CSO sign-off.
By contrast, CSOs who described their role as primarily advisory reported a familiar set of frustrations: targets set without adequate resourcing, business units treating sustainability metrics as optional, and a chronic inability to escalate compliance concerns without going through the CEO, who had other priorities. The gap between the two groups is not principally one of seniority or salary; it is one of governance design. Companies that have made sustainability work as an enterprise function have built accountability mechanisms into their operating model, not just their org chart. These mechanisms include:
The budget question deserves particular attention. Despite the structural gains of recent years, fewer than 20% of CSOs in a 2025 PwC survey reported controlling a budget sufficient to fund material transformation programmes. The majority still depend on persuading CFOs and business unit heads to release capital on a project-by-project basis, a dynamic that makes long-term sustainability investment perpetually vulnerable to short-term earnings pressure. Until that changes, the seat at the table remains somewhat provisional.
Looking ahead, the CSOs who expressed the greatest confidence about their trajectory were those whose companies had tied sustainability performance to debt covenants or credit ratings. At least 14 S&P 500 companies now have revolving credit facilities with interest rates linked to ESG performance metrics, creating a direct financial consequence for CSO underperformance. "When the treasurer is watching your numbers because they affect the cost of capital, you get a different quality of organisational attention," said one CSO at a major industrial manufacturer. The institutionalisation of that financial linkage may prove to be the most durable driver of genuine CSO authority yet.
