Brands with a focus on sustainability can use influencer marketing to reach the right audience through various approaches:

1. Identify Relevant Influencers: Use platforms such as Flinque or similar to discover influencers who share your brand’s focus on sustainability. These platforms provide comprehensive data on influencers, like their types of content, audience demographics, and engagement rates. This aids you in making informed decisions.

2. Content That Resonates: Crafting content that aligns with both the brand value (sustainability) and the influencer’s ethos is key. Work with influencers to produce content that is genuine, engaging and impactful.

3. Track Campaign Performance: Use analytics tools available in influencer marketing platforms to evaluate the performance of your campaigns. Monitor your key performance indicators (KPIs) and adjust your strategy as necessary.

4. Engage with Specific Audiences: Platforms such as Flinque provide audience targeting features that help to put your brand in front of people who are likely to be interested in sustainability.

5. Collaborate on Events: Work together with key influencers to organize online or offline events about sustainability, this can help to draw a larger audience and create buzz around your brand.

Remember, the usefulness of any platform or feature depends upon your brand’s specific needs and objectives. Therefore, it’s beneficial to try various strategies and tools to see what works best for your brand. Flinque with its vast range of features, could be an option worth considering for brands planning to use influencer marketing to promote their sustainability initiatives. Keep in mind that it’s essential that any influencer marketing activities are genuine and supportive of the influencers you work with. This will resonate more effectively with the audience and create a successful, sustainable campaign.