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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
66
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.17g CO2 per view
FIX
1.17g CO2 per view
Warning::
1.17g CO2 per page view
This page transfers 4.9 MB, producing an estimated 1.17g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.90g.
Got: 1.17g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 140.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 140.4 kg of CO2 annually — equivalent to charging 17553 smartphones.
Info::
Green hosting reduces data center emissions

1.17g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 34% of websites

Sustainable Web Design model v4 · Page size: 4.9 MB

Your site
1.17g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.24g
End-user device
0.90g
At 10,000 monthly views: Monthly: 11.7 kg · Annual: 140.4 kg · ≈ 17553 smartphone charges
D
Carbon Budget
Action
66th percentile
FIX
66th percentile
Warning::
1.17g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.17g

66th percentile

Cleaner than 34% of websites

✗ Above the median website

vs Median 95% more
vs Target 134% more
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
90% cached
PASS
90% cached
Info::
90% reduction on repeat visits
Returning visitors download only 482 KB (vs 5062 KB first visit). 244 of 255 resources are served from browser cache, saving 1.06g CO2 per repeat visit.
Info::
Repeat visit: 0.11g CO2 (first visit: 1.17g)
First visit
5062 KB
Repeat visit
482 KB

90% reduction on repeat visits

Saving 1.06g CO2 per returning visitor

244 resources served from cache · 11 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 439 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 439 KB (9% of page weight)

Unused JS 439 KB

0.10g unnecessary CO2 per visit

Actual transfer 5062 KB
Theoretical minimum 4623 KB
Potential savings 439 KB (0.10g 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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