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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
68
GRADE
D
FIX
3
REVIEW
2
PASS
2
INFO
1
Checks
8
2 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
0.82g CO2 per view
FIX
0.82g CO2 per view
Info::
0.82g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.82g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.15g, network 0.14g, end-user device 0.53g.
Got: 0.82g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 98.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 98.8 kg of CO2 annually — equivalent to charging 12352 smartphones.

0.82g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 44% of websites

Sustainable Web Design model v4 · Page size: 2.9 MB

Your site
0.82g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.15g
Network
0.14g
End-user device
0.53g
At 10,000 monthly views: Monthly: 8.2 kg · Annual: 98.8 kg · ≈ 12352 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identifiedCDN Not identified

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
56th percentile
FIX
56th percentile
Warning::
0.82g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.82g

56th percentile

Cleaner than 44% of websites

Above the median website

vs Median 37% more
vs Target 65% more
C
Transfer Efficiency
Action
62% efficient
REVIEW
62% efficient
Warning::
Transfer efficiency: 62%
An estimated 1145 KB (38%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1145 KB of unused JavaScript. This wasted data produces 0.32g of unnecessary CO2 per page view.
62% efficient

Total waste: 1145 KB (38% of page weight)

Unused JS 1145 KB

0.32g unnecessary CO2 per visit

Actual transfer 2977 KB
Theoretical minimum 1832 KB
Potential savings 1145 KB (0.32g 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+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 74 KB (vs 2977 KB first visit). 79 of 81 resources are served from browser cache, saving 0.80g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.82g)
First visit
2977 KB
Repeat visit
74 KB

97% reduction on repeat visits

Saving 0.80g CO2 per returning visitor

79 resources served from cache · 2 resources re-downloaded

A+
Web Font Weight Variants
4 font weights loaded across 1 famil(y/ies) -- reasonable
PASS
4 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
4 font weight(s) loaded across 1 famil(y/ies)
Image Optimization
14 images, 358 KB total, 236 KB wasted
INFO

Image Optimization Audit

Total Images

14

Total Size

358 KB

Oversized

10

Wasted

236 KB

4 missing dimensions 3 missing lazy loading
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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