Skip to content
https://wwd.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
53
GRADE
F
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
2.18g CO2 per view
FIX
2.18g CO2 per view
Critical::
2.18g CO2 per page view
This page transfers 7.7 MB, producing an estimated 2.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.40g, network 0.38g, end-user device 1.40g.
Got: 2.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 261.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 261.2 kg of CO2 annually — equivalent to charging 32651 smartphones.

2.18g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 7.7 MB

Your site
2.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.40g
Network
0.38g
End-user device
1.40g
At 10,000 monthly views: Monthly: 21.8 kg · Annual: 261.2 kg · ≈ 32651 smartphone charges
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.18g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.18g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 263% more
vs Target 335% more
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 1882 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1882 KB of unused JavaScript. This wasted data produces 0.52g of unnecessary CO2 per page view.
76% efficient

Total waste: 1882 KB (24% of page weight)

Unused JS 1882 KB

0.52g unnecessary CO2 per visit

Actual transfer 7870 KB
Theoretical minimum 5988 KB
Potential savings 1882 KB (0.52g 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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 330 KB (vs 7870 KB first visit). 876 of 944 resources are served from browser cache, saving 2.09g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 2.18g)
First visit
7870 KB
Repeat visit
330 KB

96% reduction on repeat visits

Saving 2.09g CO2 per returning visitor

876 resources served from cache · 68 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback