London Climate Action Week 2025: How the Climate Conversation is Evolving on LinkedIn

Almost 50,000 reactions on LinkedIn alone

In the lead-up to and during London Climate Action Week 2025, LinkedIn proved to be the most active platform for professional climate dialogue. Between 20 June and 4 July, LinkedIn saw 4,322 posts and nearly 50,000 reactions related to the event - significantly outperforming X (formerly Twitter), which generated around four times fewer posts over the same period.

This reflects a shift in where climate leadership and corporate sustainability messaging now live online. With Elon Musk’s repositioning of X towards looser moderation, many businesses and climate leaders appear to have favoured LinkedIn’s more professional, credibility-driven environment to share ideas, partnerships, and announcements.

The chart below shows just how sustained the conversation was across the two-week period:

#Cleantech, #Decarbonisation and #ClimateFinance among the top-used hashtags

Alongside classic event tags like #londonclimateactionweek, #climateaction, and #sustainability, three themes stood out in the LinkedIn conversation: #cleantech, #decarbonisation, and #greenfinance.

 

#Cleantech posts focused on innovation—from renewable energy to smart systems. #Decarbonisation highlighted efforts to reduce emissions, particularly across transport and industry. Meanwhile, #GreenFinance pointed to the growing role of capital in enabling climate goals, with posts on ESG frameworks and sustainable investment.

Together, these hashtags reflect how the conversation has moved beyond awareness towards practical, scalable solutions

An overwhelmingly positive climate conversation

As well as generating major engagement, LinkedIn also fostered a constructive, solutions-driven dialogue. According to Visibrain’s sentiment analysis, 85% of posts carried a positive tone, with professionals using the platform to share achievements, announce partnerships, and highlight concrete progress on climate goals.

Only 43 posts showed negative sentiment, but these were the exception rather than the rule. The overwhelmingly optimistic tone reflects LinkedIn’s unique role as a professional network where climate action is not as a polarising debate, but as a shared responsibility and business priority for all.

At a time when other platforms can feel fragmented or combative, LinkedIn stood out during LCAW 2025 as a space for positive momentum and credible climate leadership.

AstraZeneca tops the list of organisations driving engagement...

From pharmaceuticals to finance, a diverse mix of organisations led the LinkedIn conversation around London Climate Action Week 2025. While AstraZeneca took the top spot with over 1,700 reactions, several smaller or sector-specific players also made an impact, proving that reach isn't everything when the message resonates.

Top 10 most engaging organisations on LinkedIn:

1. AstraZeneca – 1,736 reactions

2. Zurich Insurance – 675 reactions

3. Blue Earth – 362 reactions

4. Holcim – 308 reactions

5. GenZero – 187 reactions

6. Science Based Targets initiative – 159 reactions

7. Vale – 146 reactions

8. British International Investment – 130 reactions

9. City of London Corporation – 124 reactions

10. London Stock Exchange – 121 reactions

Top Posts from Climate and Sustainability Leaders:

Not all posts are created equal. Over the course of the event, a handful of experts and professionals stood out. Here are some of the posts that sparked attention and added value to the conversation: