Sustainability consultants provide expert guidance on areas such as carbon footprint reduction, climate risk scenario planning, ESG reporting and disclosure, circular economy transitions, supply chain sustainability, and net-zero planning — helping companies navigate complex regulatory landscapes and stakeholder expectations. In 2025, the market was valued in the tens of billions of dollars, and it is projected to grow substantially through the next decade. One forecast estimates that the market will expand from approximately USD 17.65 billion in 2025 to around USD 62.62 billion by 2035, exhibiting a CAGR of about 13.5% between 2026 and 2035.

This growth is driven by heightened regulatory pressure, investor scrutiny, and corporate commitments to sustainability goals such as net-zero emissions and transparent ESG reporting. Regulations like the EU Corporate Sustainability Reporting Directive (CSRD) and climate-related disclosure mandates in other regions are compelling companies to seek specialized advisory services to meet compliance requirements and integrate sustainability into core strategy. As organizations embed sustainability into governance frameworks and operational planning, consulting firms are evolving their service offerings to include advanced digital tools, data analytics, and AI-powered solutions that improve sustainability assessments and performance tracking. Major consulting firms such as McKinsey & Company, Deloitte, PwC, EY, Accenture, and Boston Consulting Group are actively expanding their sustainability practices to support clients across industries, reflecting the market’s strategic importance in driving sustainable business transformation