Sustain What

Investor Due Diligence Report

substackClimate

A regular dose of sanity and substance amid the spin around climate and sustainability challenges.

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Key Metrics

Subscribers

10K

1K paid

Verified

Weekly Growth

~0%

Subscriber count is a platform estimate

Revenue Analysis

Pricing

$5/mo

$50/yr annual option

Est. Monthly Revenue

$4K

1K paid subs

$4K/mo – $4K/mo(±0%)

Engagement

Avg Comments/Post

1.8

Avg Likes/Post

11.5

Engagement Rate

0.13%

(comments + likes) / subscribers

Quality & Publishing

Audience Quality Score

55Fair

0100

Publishing Pace

~3x per week

2.7 posts/week

Publishing Consistency

69/100

Consistent (~3.0d avg)

Competitive Landscape (Climate)

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

Revenue Trajectory

Estimated monthly revenue over time

Month	Subscribers	Est. Revenue	Change
Feb 2026	10K	$3,975	—
Mar 2026	10K	$3,975	~0%

Risk Assessment

Key risk factors for due diligence

High

Platform Dependency

Hosted on substack subdomain

Medium

Publishing Consistency

Variable publishing frequency

Medium

Key Person

Single-author publication — key-person dependency

Low

Revenue Model

Active paid subscription tier

Monetization Readiness

Monetization status

Subscriber threshold

10K subscribers — above the 2K category median for first paid tier

Has paid tier

Active paid subscription offering

Peer monetization

100% of 25 similar-size peers in Climate have paid tiers

Pricing position

$5/mo vs $6/mo category median (185 newsletters)

Pricing History

Date	Monthly	Annual
Mar 2026	$5	$50

Data Quality

Report Data QualityFull - All metrics available

Subscriber Confidenceverified

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.

Component	Score	Weight
Engagement Rate	30/100	30%
Paid Subscriber Ratio	90/100	25%
Publishing Consistency	43/100	10%