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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
72
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.71g CO2 per view
FIX
1.71g CO2 per view
Warning::
1.71g CO2 per page view
This page transfers 7.2 MB, producing an estimated 1.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.35g, end-user device 1.31g.
Got: 1.71g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 205.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 205.1 kg of CO2 annually — equivalent to charging 25639 smartphones.
Info::
Green hosting reduces data center emissions

1.71g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 19% of websites

Sustainable Web Design model v4 · Page size: 7.2 MB

Your site
1.71g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.35g
End-user device
1.31g
At 10,000 monthly views: Monthly: 17.1 kg · Annual: 205.1 kg · ≈ 25639 smartphone charges
F
Carbon Budget
Action
81th percentile
FIX
81th percentile
Warning::
1.71g CO2 — above the median website (0.60g)
Heavier than an estimated 19% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 81th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.71g

81st percentile

Cleaner than 19% of websites

✗ Above the median website

vs Median 185% more
vs Target 242% more
B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 1071 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1071 KB of unused JavaScript. This wasted data produces 0.25g of unnecessary CO2 per page view.
86% efficient

Total waste: 1071 KB (14% of page weight)

Unused JS 1071 KB

0.25g unnecessary CO2 per visit

Actual transfer 7395 KB
Theoretical minimum 6323 KB
Potential savings 1071 KB (0.25g 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: 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 40 KB (vs 7395 KB first visit). 198 of 202 resources are served from browser cache, saving 1.70g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.71g)
First visit
7395 KB
Repeat visit
40 KB

99% reduction on repeat visits

Saving 1.70g CO2 per returning visitor

198 resources served from cache · 4 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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