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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
69
GRADE
D
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
3.52g CO2 per view
FIX
3.52g CO2 per view
Critical::
3.52g CO2 per page view
This page transfers 14.9 MB, producing an estimated 3.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.73g, end-user device 2.70g.
Got: 3.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 422.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 422.5 kg of CO2 annually — equivalent to charging 52816 smartphones.
Info::
Green hosting reduces data center emissions

3.52g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.9 MB

Your site
3.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.73g
End-user device
2.70g
At 10,000 monthly views: Monthly: 35.2 kg · Annual: 422.5 kg · ≈ 52816 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.52g 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

3.52g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 487% more
vs Target 604% more
B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 1523 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1523 KB of unused JavaScript. This wasted data produces 0.35g of unnecessary CO2 per page view.
90% efficient

Total waste: 1523 KB (10% of page weight)

Unused JS 1523 KB

0.35g unnecessary CO2 per visit

Actual transfer 15233 KB
Theoretical minimum 13710 KB
Potential savings 1523 KB (0.35g 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::
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 Not identified✗CDN Fastly✓

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 303 KB (vs 15233 KB first visit). 317 of 326 resources are served from browser cache, saving 3.45g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 3.52g)
First visit
15233 KB
Repeat visit
303 KB

98% reduction on repeat visits

Saving 3.45g CO2 per returning visitor

317 resources served from cache · 9 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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