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https://donga.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
55
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
F
CO2 Per Page Load
Action
1.76g CO2 per view
FIX
1.76g CO2 per view
Warning::
1.76g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.76g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.33g, network 0.30g, end-user device 1.13g.
Got: 1.76g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 211.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 211.6 kg of CO2 annually — equivalent to charging 26446 smartphones.

1.76g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 17% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.76g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.33g
Network
0.30g
End-user device
1.13g
At 10,000 monthly views: Monthly: 17.6 kg · Annual: 211.6 kg · ≈ 26446 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 identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
83th percentile
FIX
83th percentile
Warning::
1.76g CO2 — above the median website (0.60g)
Heavier than an estimated 17% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 83th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.76g

83rd percentile

Cleaner than 17% of websites

✗ Above the median website

vs Median 194% more
vs Target 253% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 754 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 754 KB of unused JavaScript. This wasted data produces 0.21g of unnecessary CO2 per page view.
88% efficient

Total waste: 754 KB (12% of page weight)

Unused JS 754 KB

0.21g unnecessary CO2 per visit

Actual transfer 6375 KB
Theoretical minimum 5620 KB
Potential savings 754 KB (0.21g 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 199 KB (vs 6375 KB first visit). 231 of 236 resources are served from browser cache, saving 1.71g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.76g)
First visit
6375 KB
Repeat visit
199 KB

97% reduction on repeat visits

Saving 1.71g CO2 per returning visitor

231 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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