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Platform Portability
Uses Substack subdomain (bluelines.substack.com). Migrating would require subscribers to re-subscribe at a new address.
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Blue Lines is a nonprofit founded to spread awareness of the climate impact of aviation condensation trails, and to speed up the implementation of contrail avoidance to avoid 1-2% of climate change.
Data updated 4 weeks ago
Avg Likes
2.0
Engagement Rate
0.20%· ~2 likes + comments/post
(comments + likes) / subscribers
Quality Score
Engagement vs Climate
0.20% engagement rate
Score Breakdown
Engagement Score
Track CPM rates as they change
Start tracking — freeWe began tracking Blue Lines. A growth trend will appear once we have more data points.
vs 22 newsletters in Climate
1K places you in the top 50% of newsletters in this category.
Engagement Rate
0.20%
median: 0.00%
Posts per Week
1.0
median: 1.0
Subscribers
1K
median: 1K
The Rewilder Weekly
1K subs
Elemental
1K subs
A Wider Lens by Dr Kenneth Silvestri
1K subs
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Publishing Frequency
Weekly
Last published Apr 16, 2026
1.0 posts/week avg
Climate Pricing
$6/mo median
Your newsletter: Free
Monetization Readiness
Climate newsletters typically start charging at ~2K subscribers
50% of typical monetisation threshold
100% of similar-size Climate newsletters have paid tiers
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