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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
88
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 REVIEW 1 FIX
D
Carbon Budget
Action
54th percentile
FIX
54th percentile
Warning::
0.77g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.77g

54th percentile

Cleaner than 46% of websites

✗ Above the median website

vs Median 28% more
vs Target 54% more
B
CO2 Per Page Load
0.77g CO2 per view
REVIEW
0.77g CO2 per view
Info::
0.77g CO2 per page view
This page transfers 3.2 MB, producing an estimated 0.77g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.16g, end-user device 0.59g.
Got: 0.77g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 92.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 92.2 kg of CO2 annually — equivalent to charging 11527 smartphones.
Info::
Green hosting reduces data center emissions

0.77g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 46% of websites

Sustainable Web Design model v4 · Page size: 3.2 MB

Your site
0.77g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.16g
End-user device
0.59g
At 10,000 monthly views: Monthly: 7.7 kg · Annual: 92.2 kg · ≈ 11527 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓

Cloudflare: 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
88% cached
PASS
88% cached
Info::
88% reduction on repeat visits
Returning visitors download only 401 KB (vs 3324 KB first visit). 118 of 122 resources are served from browser cache, saving 0.68g CO2 per repeat visit.
Info::
Repeat visit: 0.09g CO2 (first visit: 0.77g)
First visit
3324 KB
Repeat visit
401 KB

88% reduction on repeat visits

Saving 0.68g CO2 per returning visitor

118 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 233 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 233 KB (7% of page weight)

Unused JS 233 KB

0.05g unnecessary CO2 per visit

Actual transfer 3324 KB
Theoretical minimum 3091 KB
Potential savings 233 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

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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