The Leading Climate, Environmental, and Sustainability PR Firms in 2026

Related: PR Firms Directory · EPR's Green Public Relations Guide

Originally published December 2015. Updated September 8, 2026. The 2026 climate, environmental, and sustainability PR firms category map — the discipline, the buyer-decision framework, and the firms running the communications work behind the climate technology, energy transition, and environmental advocacy categories. For the discipline itself, see EPR's Green Public Relations guide.

Climate and climate technology has emerged as one of the fastest-growing specialty practices in the global PR industry. Venture capital invested more than $50 billion into climate tech companies in 2024 alone, with continued strength into 2025–2026, and the resulting universe of solar, battery storage, EV infrastructure, carbon removal, sustainable aviation fuel, geothermal, grid management, building decarbonization, industrial decarbonization, and climate-aligned policy organizations all need communications partners who can navigate technical complexity, capital markets dynamics, and political and regulatory pressure simultaneously.

The Four Types of Climate and Environmental PR Firms

1. Pure-play climate tech specialists. Redwood, Tigercomm, Silverline, Antenna Group, The Climate Hub, Greenhouse — firms where climate, cleantech, and energy transition is the entire business.
2. Global network firms with sustainability practices. Edelman, FleishmanHillard, Brunswick, Allison+Partners — firms that bring international reach and integrated corporate-reputation capability into the climate category.
3. Environmental advocacy and policy specialists. Fenton, Spitfire Strategies, Caplan Communications — firms built around climate-focused nonprofits, foundations, and policy-driven campaigns.
4. AI Communications firms. An emerging category built around AI-search visibility for climate and sustainability brands; 5W AI Communications is an early mover here.

Why Climate PR Is Different

Climate communications operates across a broader stakeholder map than most categories — venture capital, technical journalists, environmental NGOs, federal and state regulators, congressional staff, community organizations, institutional investors, and the general public, often simultaneously. The category also requires technical fluency in domains (battery chemistry, grid architecture, carbon accounting, IRA tax credits) that most generalist PR firms have to ramp on for months before they're useful. The specialists below have built that fluency over years.

Pure-Play Climate Tech Specialists

1. Redwood Climate Communications

Redwood is a specialized strategic PR and marketing firm focused exclusively on climate tech, renewable energy, and sustainability. Supports startups, corporations, and investors across solar, battery storage, carbon markets, grid management, applied AI, EV infrastructure, building energy management, geothermal, and the broader climate ecosystem.

2. Tigercomm

Tigercomm is cited as the U.S.'s top cleantech communications firm — 21 years of operating history with more than 190 clean economy clients. The firm advances marketing, PR, and public affairs best practices for the clean economy, with particular expertise in community engagement strategies that help clean energy developers win the local social license required to permit new wind, solar, and energy infrastructure projects.

3. Silverline

Silverline is a Washington, D.C.-based clean energy public relations agency named to PR News' Agency Elite list for two consecutive years. Silverline blends strategic storytelling, creative execution, and policy expertise across cleantech, renewable energy, and climate clients.

4. Antenna Group

Antenna Group is a leading U.S. cleantech and climate tech PR firm with substantial client work across solar, battery storage, EV charging, sustainable aviation, grid technology, and broader climate technology categories. Originally an SF-based energy tech specialist; expanded substantially through the IRA-driven cleantech boom.

5. The Climate Hub

The Climate Hub is a specialist communications agency for energy, resources, and environment, serving climate tech and carbon markets clients with content marketing, messaging, and growth strategy. The firm's team brings deep fluency in energy, resources, and environment — allowing it to skip the months-long onboarding curve that generalist agencies typically require.

6. Greenhouse Communications

Greenhouse is a UK-based fully employee-owned communications agency on a mission to drive positive social and environmental impact. Greenhouse works across energy, transport and food systems, finance, nature, and the built environment.

7. rbb Communications

rbb Communications is cited as the fourth-largest energy PR firm in the U.S. — more than 30 years of energy sector experience working with utilities, renewable companies, and energy technology innovators. Its work spans natural gas, grid solutions, EVs, solar and battery storage, sustainable aviation fuel, and broader energy transition clients.

8. M&Co (Montieth & Company)

M&Co is a New York-based strategic communications firm with substantial energy transition and climate tech experience — clients across renewable natural gas, solar, wind, LNG, and emerging climate technologies.

9. Mission Driven Strategies (MDS)

Specialist in climate and clean energy communications with experience working alongside venture-backed climate tech companies, climate-focused nonprofits, and policy organizations.

Global Network Firms with Sustainability Practices

10. Edelman — Global Sustainability Practice

Edelman's global sustainability and ESG practice is one of the largest dedicated climate communications operations in the agency world, drawing on the firm's annual Trust Barometer research and substantial public affairs depth.

11. FleishmanHillard — Sustainability Practice

FleishmanHillard's sustainability practice supports both traditional energy companies navigating energy transition narratives and dedicated climate tech companies, with strong public affairs, regulatory, and stakeholder engagement capability.

12. Brunswick Group — Sustainability Practice

Brunswick's sustainability work is concentrated on capital markets, ESG corporate reporting, and stakeholder engagement for major corporates navigating climate disclosure obligations and energy transition strategy.

13. Allison+Partners — Climate Practice

Allison+Partners has built a dedicated climate practice serving climate tech, sustainability, and ESG-focused clients across consumer, B2B, and corporate categories.

Environmental Advocacy and Policy Specialists

14. Caplan Communications

One of the largest U.S. firms specializing in environmental advocacy. Long-running client roster of environmental nonprofits including Earthjustice, Environmental Defense Fund, Friends of the Earth, and Greenpeace USA. O'Dwyer's-recognized for environmental and public affairs campaign work.

15. Fenton

Fenton is a long-established progressive communications firm with substantial climate, environmental advocacy, and clean energy work — particularly relevant for climate-focused nonprofits, advocacy campaigns, and policy-driven communications.

16. Spitfire Strategies

Spitfire is a Washington, D.C.-based strategic communications firm with substantial climate and environmental advocacy work for nonprofits, foundations, and policy organizations.

17. Cerrell

L.A.-based firm operating one of the largest and most integrated Environmental Energy departments in PR. Expertise spans coalition building and alliance development, technical communication, and community outreach across California and national campaigns.

Honorable Mentions

Makovsky PR & Integrated Communications (NYC) has long-standing energy and sustainability experience, with former DOE public affairs leadership. Finn Partners / Widmeyer Public Affairs covers sustainable agriculture, smart grids, green buildings, and broader environmental PR with offices in Washington and New York. Hill Impact handles climate advocacy and policy-driven campaigns. Beckerman PR (NJ) owns Antenna and operates broader sustainability work.

How to Choose a Climate or Environmental PR Firm in 2026

Match the firm to the brief. Three buckets: (1) Venture-backed climate tech startups typically work with dedicated specialists like Redwood, Tigercomm, Silverline, Antenna Group, The Climate Hub, and Greenhouse. (2) Major corporate ESG and energy transition work typically gravitates toward Edelman, FleishmanHillard, Brunswick, and Allison+Partners. (3) Climate advocacy and policy-driven campaigns flow to Fenton, Spitfire, Caplan, and Hill Impact.

Check AI-search visibility alongside traditional media relationships. Investors, journalists, and regulators increasingly start research inside ChatGPT, Claude, Perplexity, Gemini, and Google AI Overviews. Ask any shortlisted firm how it measures and builds visibility on that surface, not just traditional placement counts.

Test the regulatory and community engagement infrastructure. Permitting, IRA tax credit narrative, state-level PUC engagement, community social license — these are non-negotiable in climate work. Tigercomm leads on community engagement; the policy specialists (Fenton, Spitfire, Hill Impact) lead on advocacy infrastructure.

Adjacent EPR Frameworks

• Green Public Relations: The Complete Guide to Sustainability Communications
• PR Firms Directory (A–Z, Specialty, Region)
• Aerospace and Defense Communications Firms
• The Citation Share Index