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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
73
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.94g CO2 per view
FIX
0.94g CO2 per view
Info::
0.94g CO2 per page view
This page transfers 4.0 MB, producing an estimated 0.94g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.19g, end-user device 0.72g.
Got: 0.94g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 113.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 113.0 kg of CO2 annually — equivalent to charging 14123 smartphones.
Info::
Green hosting reduces data center emissions

0.94g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 41% of websites

Sustainable Web Design model v4 · Page size: 4.0 MB

Your site
0.94g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.19g
End-user device
0.72g
At 10,000 monthly views: Monthly: 9.4 kg · Annual: 113.0 kg · ≈ 14123 smartphone charges
D
Carbon Budget
Action
59th percentile
FIX
59th percentile
Warning::
0.94g CO2 — above the median website (0.60g)
Heavier than an estimated 41% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 59th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.94g

59th percentile

Cleaner than 41% of websites

✗ Above the median website

vs Median 57% more
vs Target 88% more
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 551 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 551 KB of unused JavaScript. This wasted data produces 0.13g of unnecessary CO2 per page view.
86% efficient

Total waste: 551 KB (14% of page weight)

Unused JS 551 KB

0.13g unnecessary CO2 per visit

Actual transfer 4073 KB
Theoretical minimum 3522 KB
Potential savings 551 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::
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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 104 KB (vs 4073 KB first visit). 234 of 237 resources are served from browser cache, saving 0.92g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.94g)
First visit
4073 KB
Repeat visit
104 KB

97% reduction on repeat visits

Saving 0.92g CO2 per returning visitor

234 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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