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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
65
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
1.99g CO2 per view
FIX
1.99g CO2 per view
Warning::
1.99g CO2 per page view
This page transfers 8.4 MB, producing an estimated 1.99g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.41g, end-user device 1.53g.
Got: 1.99g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 238.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 238.3 kg of CO2 annually — equivalent to charging 29782 smartphones.
Info::
Green hosting reduces data center emissions

1.99g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 8.4 MB

Your site
1.99g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.41g
End-user device
1.53g
At 10,000 monthly views: Monthly: 19.9 kg · Annual: 238.3 kg · ≈ 29782 smartphone charges
F
Carbon Budget
Action
89th percentile
FIX
89th percentile
Warning::
1.99g CO2 — above the median website (0.60g)
Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 89th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.99g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 231% more
vs Target 297% more
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 1546 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1546 KB of unused JavaScript. This wasted data produces 0.36g of unnecessary CO2 per page view.
82% efficient

Total waste: 1546 KB (18% of page weight)

Unused JS 1546 KB

0.36g unnecessary CO2 per visit

Actual transfer 8590 KB
Theoretical minimum 7043 KB
Potential savings 1546 KB (0.36g 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 148 KB (vs 8590 KB first visit). 312 of 317 resources are served from browser cache, saving 1.95g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.99g)
First visit
8590 KB
Repeat visit
148 KB

98% reduction on repeat visits

Saving 1.95g CO2 per returning visitor

312 resources served from cache · 5 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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