Climate Tech — What's Going On (May 2026)

The Short Version

Climate tech software is a real market ($38.5 billion growing to $115.4 billion), but the part a solo founder can actually reach got much smaller in 2026. Some climate rules that used to force companies to buy this kind of software got weakened or cancelled (a US rule from the SEC requiring climate disclosures was withdrawn, and a European rule called CSRD now applies to fewer companies). That means fewer small businesses are being pushed to buy carbon-tracking software. The big, well-funded companies (Watershed, Greenly, Normative, Persefoni) have already locked up the customers who still need to report their environmental impact. The best options left for a solo founder: helping specific industries prove where their supply chain comes from (like food and drink companies), tracking packaging rules, or helping landlords track how energy-efficient their buildings are.

We previously looked at and passed on three other ideas in this space: a carbon-footprint questionnaire for small businesses, software for solar installers, and a calculator for government solar rebates.

One more thing: this is a different topic from "Climate and Clean Energy," which covers the hardware side — things like solar panels and EV chargers. This page is about climate software: tracking a company's environmental impact and proving it to others.

How Big Is This, Really?

The big numbers:

• Grand View Research says climate tech (hardware and software combined) will grow from $38.5 billion in 2024 to $115.4 billion by 2030 — about 20.9% bigger every year
• Just the software for tracking carbon emissions and environmental impact is roughly $8–15 billion in 2025, growing 22–26% a year
• MarketsandMarkets says software specifically for tracking environmental, social, and governance data (usually called "ESG") will grow from $1.5 billion in 2023 to $4.5 billion by 2028 — about 25.1% bigger every year

Who's actually paying, and whether a solo founder could reach them:

How much of that could one person actually reach? Sustainability reporting for specific industries adds up to roughly $200–500 million — much smaller than the giant headline number.

The Real Problems People Have

Food and drink brands proving where their ingredients come from

• Walmart and Target now require their suppliers to report carbon emissions across their whole supply chain — and that's trickling down to small food brands
• Food brands also need to prove things like whether their packaging can be recycled, and how much water they use
• There's no affordable tool for a food brand making $2 million a year to track and report all of this at $49–99/month

Landlords proving their buildings are energy-efficient

• Landlords need a good score from a program called GRESB to attract environmentally-conscious big investors as tenants
• A free government program called ENERGY STAR scores how efficient a building is, but all the data has to be entered by hand, which takes a long time
• There's no $49–99/month tool that automatically pulls this data from utility bills instead of requiring manual entry

Getting certified as an environmentally responsible company (B Corp)

• Getting certified as a "B Corp" (a label showing a company meets certain social and environmental standards) requires answering about 200 detailed questions with proof — usually tracked in spreadsheets
• One person described it as: "I'm doing our B Corp renewal and it's 40 hours of gathering evidence from 5 different systems"
• Companies making $1–10 million a year who are working toward this certification would pay $29–49/month for a tool that organizes all the proof they need

Who Else Is Already Doing This

Big-company carbon tracking (out of reach for a solo founder)

• Watershed — $30,000+/year, backed by big investors including Sequoia
• Greenly — $8,000–$30,000+/year, mostly used in Europe
• Persefoni — built for big companies reporting to regulators
• Normative — built for big companies, focused on the European CSRD rule
• Sweep — also built for big companies
• All of these are completely out of reach for a solo founder's pricing

Small-business carbon tools (mostly hurt by the rule changes)

• Aclymate — $120+/year, basic carbon tracking for small businesses
• Seedling — small-business carbon tracking, has a free tier
• Emerald Power — also built for small businesses
• These tools lost a lot of their reason to exist once the US disclosure rule was withdrawn

Tools for getting B Corp certified

• B Impact Assessment — a free tool from the nonprofit that runs B Corp certification, but it feels like using a spreadsheet
• Niamme — a newer tool built just for collecting B Corp evidence
• The gap: a $29–49/month tool for collecting B Corp evidence that actually walks you through the process

Tools for landlords tracking building efficiency

• GRESB — the standard score that big investment funds look at, but only really built for large funds
• Measurabl — $600+/year, a commercial real estate sustainability tool
• The gap: an affordable tool that helps an individual landlord get their ENERGY STAR score, at $29–49/month

What You Could Actually Build

BEST BET — Helping companies collect proof for B Corp certification

• The problem: companies going for B Corp certification spend 30–40 hours gathering evidence from different systems
• Who would pay: consumer brands making $1–20 million a year going for B Corp — there are about 4,000 certified B Corps in the US, and about 50,000 more companies working toward it
• What you'd build: match up all 200 B Corp questions to the type of proof needed → walk people through uploading and storing it → export everything for their final submission
• Pricing: $49/month while going through certification, $29/month in later years for renewal
• What you're up against: Niamme already exists but is narrow, and the official B Corp tool is free but feels like a clunky spreadsheet
• Realistic expectations: real pain, but a small total market, and not much regulatory risk

Helping landlords track building efficiency

• The problem: commercial landlords need an ENERGY STAR score, but pulling together the data (utility bills, building details) is all manual
• Who would pay: property managers overseeing 5–20 buildings, $29–49/month
• What you'd build: upload utility bills → automatically pull out the energy-usage numbers → calculate the ENERGY STAR score → track whether it's improving year over year
• Pricing: $29–49/month per group of buildings
• Realistic expectations: growing, but still optional in most places, so demand depends on the city

Helping food brands prove their supply chain is responsible

• The problem: food brands need to report their supply chain's environmental impact to big retailers like Walmart and Target
• Who would pay: food and drink brands making $1–20 million a year, $79–149/month
• What you'd build: a supplier questionnaire + a database of typical emissions for different food ingredients + report templates built for what each retailer specifically wants
• Realistic expectations: a real requirement coming from big retailers, but collecting data from a company's suppliers is genuinely complicated

The Bottom Line

Building climate software as a solo founder got harder in 2026. The rule changes — the US disclosure rule being withdrawn, and the European rule applying to fewer companies — removed a lot of the reason small businesses would have been forced to buy this kind of software. Helping companies get B Corp certified is the most reliable source of pain, because more companies are choosing to get certified anyway, and the process itself is genuinely painful no matter what the government requires. But the total market is small. If you're going to build in climate tech, pick something with an existing rule or requirement behind it — like ENERGY STAR in certain cities, or a specific retailer's supply-chain requirement — instead of betting on companies doing it purely because they want to.

Where These Numbers Come From

• Grand View Research — Climate Tech: $38.5 billion (2024) growing to $115.4 billion (2030), about 20.9% a year (as of April 2026)
• MarketsandMarkets — ESG Management Software: $1.5 billion (2023) growing to $4.5 billion (2028), about 25.1% a year
• General industry knowledge — pricing for Watershed, Greenly, and Normative, patterns from the B Corp community, and the regulatory context