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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
81
GRADE
B
FIX
0
REVIEW
4
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 4 REVIEW
B
CO2 Per Page Load
0.56g CO2 per view
REVIEW
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.43g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 66.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 66.8 kg of CO2 annually — equivalent to charging 8345 smartphones.
Info::
Green hosting reduces data center emissions

0.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 55% of websites

Sustainable Web Design model v4 · Page size: 2.4 MB

Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.12g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 66.8 kg · ≈ 8345 smartphone charges
B
Carbon Budget
45th percentile
REVIEW
45th percentile
Info::
0.56g CO2 — below the median website (0.60g)
Better than an estimated 55% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 45th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.56g

45th percentile

Cleaner than 55% of websites

✗ Above the median website

vs Median 7% cleaner ✓
vs Target 11% more
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 570 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 570 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
76% efficient

Total waste: 570 KB (24% of page weight)

Unused JS 570 KB

0.13g unnecessary CO2 per visit

Actual transfer 2407 KB
Theoretical minimum 1836 KB
Potential savings 570 KB (0.13g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Heroku: Runs on AWS; renewable status depends on region
Info::
Fastly: 100% renewable energy for edge network
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Heroku✗CDN Fastly✓

Heroku: Runs on AWS; renewable status depends on region

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 155 KB (vs 2407 KB first visit). 66 of 69 resources are served from browser cache, saving 0.52g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.56g)
First visit
2407 KB
Repeat visit
155 KB

94% reduction on repeat visits

Saving 0.52g CO2 per returning visitor

66 resources served from cache · 3 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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