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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
68
GRADE
D
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
1.34g CO2 per view
FIX
1.34g CO2 per view
Warning::
1.34g CO2 per page view
This page transfers 5.7 MB, producing an estimated 1.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.28g, end-user device 1.03g.
Got: 1.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 160.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 160.5 kg of CO2 annually — equivalent to charging 20067 smartphones.
Info::
Green hosting reduces data center emissions

1.34g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 29% of websites

Sustainable Web Design model v4 · Page size: 5.7 MB

Your site
1.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.28g
End-user device
1.03g
At 10,000 monthly views: Monthly: 13.4 kg · Annual: 160.5 kg · ≈ 20067 smartphone charges
F
Carbon Budget
Action
71th percentile
FIX
71th percentile
Warning::
1.34g CO2 — above the median website (0.60g)
Heavier than an estimated 29% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 71th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.34g

71st percentile

Cleaner than 29% of websites

✗ Above the median website

vs Median 123% more
vs Target 168% more
C
Transfer Efficiency
Action
71% efficient
REVIEW
71% efficient
Warning::
Transfer efficiency: 71%
An estimated 1663 KB (29%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1663 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.
71% efficient

Total waste: 1663 KB (29% of page weight)

Unused JS 1663 KB

0.38g unnecessary CO2 per visit

Actual transfer 5787 KB
Theoretical minimum 4124 KB
Potential savings 1663 KB (0.38g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 20 KB (vs 5787 KB first visit). 123 of 124 resources are served from browser cache, saving 1.33g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.34g)
First visit
5787 KB
Repeat visit
20 KB

100% reduction on repeat visits

Saving 1.33g CO2 per returning visitor

123 resources served from cache · 1 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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