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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
76
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.86g CO2 per view
FIX
0.86g CO2 per view
Info::
0.86g CO2 per page view
This page transfers 3.6 MB, producing an estimated 0.86g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.66g.
Got: 0.86g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 102.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 102.6 kg of CO2 annually — equivalent to charging 12825 smartphones.
Info::
Green hosting reduces data center emissions

0.86g

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
0.86g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.18g
End-user device
0.66g
At 10,000 monthly views: Monthly: 8.6 kg · Annual: 102.6 kg · ≈ 12825 smartphone charges
D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.86g 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

0.86g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 43% more
vs Target 71% more
B
Transfer Efficiency
77% efficient
REVIEW
77% efficient
Info::
Transfer efficiency: 77%
An estimated 861 KB (23%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 861 KB of unused JavaScript. This wasted data produces 0.20g of unnecessary CO2 per page view.
77% efficient

Total waste: 861 KB (23% of page weight)

Unused JS 861 KB

0.20g unnecessary CO2 per visit

Actual transfer 3699 KB
Theoretical minimum 2837 KB
Potential savings 861 KB (0.20g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Amazon Web Services✓CDN Cloudflare✓

Amazon Web Services: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 72 KB (vs 3699 KB first visit). 279 of 293 resources are served from browser cache, saving 0.84g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.86g)
First visit
3699 KB
Repeat visit
72 KB

98% reduction on repeat visits

Saving 0.84g CO2 per returning visitor

279 resources served from cache · 14 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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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