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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
62
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
3.57g CO2 per view
FIX
3.57g CO2 per view
Critical::
3.57g CO2 per page view
This page transfers 15.1 MB, producing an estimated 3.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.74g, end-user device 2.74g.
Got: 3.57g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 428.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 428.7 kg of CO2 annually — equivalent to charging 53593 smartphones.
Info::
Green hosting reduces data center emissions

3.57g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 15.1 MB

Your site
3.57g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.74g
End-user device
2.74g
At 10,000 monthly views: Monthly: 35.7 kg · Annual: 428.7 kg · ≈ 53593 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.57g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

3.57g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 495% more
vs Target 615% more
B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 1989 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1989 KB of unused JavaScript. This wasted data produces 0.46g of unnecessary CO2 per page view.
87% efficient

Total waste: 1989 KB (13% of page weight)

Unused JS 1989 KB

0.46g unnecessary CO2 per visit

Actual transfer 15457 KB
Theoretical minimum 13468 KB
Potential savings 1989 KB (0.46g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Cloudflare✓CDN Cloudflare✓

Cloudflare: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 592 KB (vs 15457 KB first visit). 496 of 519 resources are served from browser cache, saving 3.44g CO2 per repeat visit.
Info::
Repeat visit: 0.14g CO2 (first visit: 3.57g)
First visit
15457 KB
Repeat visit
592 KB

96% reduction on repeat visits

Saving 3.44g CO2 per returning visitor

496 resources served from cache · 23 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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