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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
1.06g CO2 per view
FIX
1.06g CO2 per view
Warning::
1.06g CO2 per page view
This page transfers 4.5 MB, producing an estimated 1.06g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.22g, end-user device 0.81g.
Got: 1.06g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 127.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 127.1 kg of CO2 annually — equivalent to charging 15891 smartphones.
Info::
Green hosting reduces data center emissions

1.06g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 37% of websites

Sustainable Web Design model v4 · Page size: 4.5 MB

Your site
1.06g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.22g
End-user device
0.81g
At 10,000 monthly views: Monthly: 10.6 kg · Annual: 127.1 kg · ≈ 15891 smartphone charges
D
Carbon Budget
Action
63th percentile
FIX
63th percentile
Warning::
1.06g CO2 — above the median website (0.60g)
Heavier than an estimated 37% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 63th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.06g

63rd percentile

Cleaner than 37% of websites

✗ Above the median website

vs Median 77% more
vs Target 112% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 524 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 524 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
89% efficient

Total waste: 524 KB (11% of page weight)

Unused JS 524 KB

0.12g unnecessary CO2 per visit

Actual transfer 4583 KB
Theoretical minimum 4059 KB
Potential savings 524 KB (0.12g 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
83% cached
PASS
83% cached
Info::
83% reduction on repeat visits
Returning visitors download only 792 KB (vs 4583 KB first visit). 170 of 173 resources are served from browser cache, saving 0.88g CO2 per repeat visit.
Info::
Repeat visit: 0.18g CO2 (first visit: 1.06g)
First visit
4583 KB
Repeat visit
792 KB

83% reduction on repeat visits

Saving 0.88g CO2 per returning visitor

170 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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