Terra Affirma
Investor Due Diligence Report
substackClimate
Weekly comics poetry and illustrated essays about the environment, natural history, and how we find home in our bodies and in the world, from artist and writer Sarah Gilman.
200
20 paid
N/A
Pricing
$5/mo
$50/yr annual option
$80
20 paid subs
$80/mo – $80/mo(±0%)
1.3
4.0
2.67%
(comments + likes) / subscribers
Weekly
1.0 posts/week
Score based on available components only.
| Component | Score | Weight |
|---|---|---|
| Newsletter | Subscribers | Weekly Growth | Price | Platform |
|---|---|---|---|---|
| HEATED | 140K | -0.3% | $8/mo | substack |
| The Crucial Years | 123K | +0.9% | $6/mo | substack |
| Energy Talking Points by Alex Epstein | 57K | N/A | $9/mo | substack |
| The Hotshot Wake Up | 32K | N/A | $6.99/mo | substack |
| Month | Subscribers | Est. Revenue | Change |
|---|---|---|---|
| Mar 2026 | 200 | $79.5 | — |
| Apr 2026 | 200 | $79.5 | ~0% |
Platform Dependency
Hosted on substack subdomain
Key Person
Single-author publication — key-person dependency
Revenue Model
Active paid subscription tier
Subscriber threshold
200 subscribers — below the 2K category median (based on 104 newsletters)
Has paid tier
Active paid subscription offering
Peer monetization
100% of 48 similar-size peers in Climate have paid tiers
Pricing position
$5/mo vs $6/mo category median (185 newsletters)
| Date | Monthly | Annual |
|---|---|---|
| Mar 2026 | $5 | $50 |
Disclaimer: This report is generated automatically based on publicly available data and proprietary estimation models. Estimated subscriber counts are derived from engagement patterns and should be verified through direct disclosure. Revenue estimates are based on known pricing and estimated paid subscriber counts. This report is for informational purposes only and should not be the sole basis for investment decisions.
| Engagement Rate |
| 70/100 |
| 30% |
| Paid Subscriber Ratio | 90/100 | 25% |
| David Gelles |
| 30K |
| N/A |
| Free |
| substack |