Sustainability consulting

Build a business that thrives by doing good

cactusGREEN helps organisations in Singapore and beyond develop ESG strategies, sustainability reports, and training programmes that create real, lasting impact.

🌿
Our focus
ESG Strategy & Reporting
📋
Standards we work to
GRI · ISO · SDGs
🏛️
Clients include
MNCs · SMEs · Gov Agencies
Recognised by
bizSAFE-ready Cactus Communications Ministry of Manpower partner NUS-trained leadership 25+ years combined experience
What we do

Three pillars of meaningful sustainability

01 — Audit & Report

Know where you stand

We assess your current footprint, benchmark you against peers, and turn the findings into a polished, stakeholder-ready sustainability report.

  • Industry benchmarking & trend analysis
  • Issues prioritisation & materiality review
  • GRI-aligned sustainability reporting
02 — ESG Consulting

Transform how you operate

From gap analysis to full ESG programme design, we embed sustainability into your corporate strategy — not just your annual report.

  • Impact analysis & risk mapping
  • Environment, Social & Governance (ESG) programme development
  • Corporate transformation roadmaps
03 — Training

Build capability from within

Equip your team with the skills and frameworks to keep sustainability momentum alive — long after the consultants have left.

  • GRI standards training for in-house teams
  • Leadership capacity-building workshops
  • Annual external reviews & refreshers
Our approach

Resilience rooted in your business

Inspired by the humble cactus — which thrives precisely because it works with its environment — we build sustainability programmes that are genuinely embedded, not bolted on. Our team brings deep corporate communications expertise together with rigorous environmental science.

1

Honest diagnosis first

We start by listening — to your goals, your constraints, and your stakeholders — before recommending anything.

2

Science-backed, communication-ready

Our PhD-level scientists and award-winning communicators work side by side so your ESG narrative is both rigorous and compelling.

3

Programmes that outlast us

Every engagement ends with your team more capable than when we started — trained, equipped, and ready to carry the work forward.

Projects

Sustainability work that endures

Singapore Indonesia Agribusiness
Ongoing since 2012

GRI Sustainability Reporting

A long-running advisory engagement with an agribusiness operating across Singapore and Indonesia. We assess programme effectiveness, review key performance indicators, and ensure sustainability reports meet GRI guidelines. Where gaps or stakeholder concerns arise, we develop targeted messaging and content to address them with clarity and credibility.

GRI reporting KPI review Programme effectiveness Stakeholder communications
Singapore Marine Conservation

Singapore Cooperation Programme — Marine Conservation

Developed and delivered a comprehensive programme on Singapore's experience in marine conservation for 20-over delegates from 18 countries, organised by the Ministry of Foreign Affairs under the Singapore Cooperation Programme.

Programme development Stakeholder engagement Government partnership
Singapore Maritime & Ports

World's First Integrated Report — Government Agency

Developed messages and content — including programme reviews on key materiality issues and a thorough gap analysis — to produce the world's first Integrated Report for a government agency.

Integrated reporting Materiality review Gap analysis Content development
International Engineering & Defence

Global CSR & Community Engagement

Developed comprehensive CSR programmes to engage local communities globally. Communicated sustainability messages across employee, partner and community stakeholder groups to support employee branding and corporate responsibility initiatives.

CSR programme design Employee branding Community engagement Stakeholder communications
Denmark Asia Pacific Water Engineering

Sustainability Communications — Global Pump Maker

Conducted extensive media engagements and developed messages and content to communicate sustainability efforts to customers and partners on behalf of one of the world's leading pump manufacturers.

Media engagement Content development Sustainability messaging B2B communications
Singapore Real Estate

Inaugural Sustainability Report — REIT

Conceptualised and structured the first Sustainability Report for a leading real estate investment trust — ahead of the industry. Reviewed programmes and developed messages and content to meet GRI reporting criteria.

GRI reporting Report structure Programme review Industry-first initiative
The team

Practitioners, not just advisors

MT

Mark Tan, ALM, MBA, BBA (Merit)

Chief Sustainability Consultant

A technology, sustainability and smart city strategist with over 25 years of senior leadership experience across government, defence and the private sector. Co-founder and Executive Director of Cactus Communications, Mark has advised clients including De Beers, the Ministry of Manpower, the Royal Danish Embassy and the Singapore Police Force on business strategy, CSR and communications. He has developed CSR programmes and enterprise risk management frameworks for DSTA and NCS, and held senior executive roles at ST Kinetics, SingTel and the Ministry of Defence. He has a Master of Liberal Arts in Sustainability at Harvard University, reflecting his commitment to rigorous, evidence-based practice. Mark holds a Bachelor's and MBA from NUS Business School.

NM

Natalie Mah, BA

Sustainability Programme Director

A seasoned corporate communications and public affairs leader with deep experience across Singapore's government, defence and hospitality sectors. Natalie began her career at the Ministry of Defence, where she led national campaign communications and policy announcements, before moving to Sentosa Development Corporation to apply her expertise to tourism and lifestyle. As Head of Corporate Communications at Singapore Technologies Kinetics, she translated complex defence and commercial business objectives into clear stakeholder narratives. At Cactus, she provides communications and PR advisory to government agencies, MNCs and SMEs across industries including agriculture, education, engineering, health, hospitality and real estate. She specialises in media relations and high-quality content for corporate and trade publications. Natalie holds a Bachelor of Arts from the National University of Singapore.

Ready to make sustainability your competitive edge?

Whether you're starting from scratch or scaling an existing programme, we'd love to hear about your goals. Drop us a note and one of our consultants will be in touch within two business days.

Email us to get started