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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
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.85g CO2 per view
FIX
0.85g CO2 per view
Info::
0.85g CO2 per page view
This page transfers 3.6 MB, producing an estimated 0.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.65g.
Got: 0.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 101.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 101.9 kg of CO2 annually — equivalent to charging 12743 smartphones.
Info::
Green hosting reduces data center emissions

0.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site
0.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.18g
End-user device
0.65g
At 10,000 monthly views: Monthly: 8.5 kg · Annual: 101.9 kg · ≈ 12743 smartphone charges
D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.85g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.85g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 42% more
vs Target 70% more
C
Transfer Efficiency
Action
70% efficient
REVIEW
70% efficient
Warning::
Transfer efficiency: 70%
An estimated 1101 KB (30%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1101 KB of unused JavaScript. This wasted data produces 0.25g of unnecessary CO2 per page view.
70% efficient

Total waste: 1101 KB (30% of page weight)

Unused JS 1101 KB

0.25g unnecessary CO2 per visit

Actual transfer 3675 KB
Theoretical minimum 2574 KB
Potential savings 1101 KB (0.25g 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
89% cached
PASS
89% cached
Info::
89% reduction on repeat visits
Returning visitors download only 395 KB (vs 3675 KB first visit). 103 of 107 resources are served from browser cache, saving 0.76g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 0.85g)
First visit
3675 KB
Repeat visit
395 KB

89% reduction on repeat visits

Saving 0.76g CO2 per returning visitor

103 resources served from cache · 4 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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