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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
F
CO2 Per Page Load
Action
4.45g CO2 per view
FIX
4.45g CO2 per view
Critical::
4.45g CO2 per page view
This page transfers 18.8 MB, producing an estimated 4.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.92g, end-user device 3.42g.
Got: 4.45g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 534.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 534.1 kg of CO2 annually — equivalent to charging 66756 smartphones.
Info::
Green hosting reduces data center emissions

4.45g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 18.8 MB

Your site
4.45g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.11g
Network
0.92g
End-user device
3.42g
At 10,000 monthly views: Monthly: 44.5 kg · Annual: 534.1 kg · ≈ 66756 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
4.45g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

4.45g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 642% more
vs Target 790% more
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 309 KB (vs 19254 KB first visit). 409 of 416 resources are served from browser cache, saving 4.38g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 4.45g)
First visit
19254 KB
Repeat visit
309 KB

98% reduction on repeat visits

Saving 4.38g CO2 per returning visitor

409 resources served from cache · 7 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 1060 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 1060 KB (6% of page weight)

Unused JS 1060 KB

0.25g unnecessary CO2 per visit

Actual transfer 19254 KB
Theoretical minimum 18193 KB
Potential savings 1060 KB (0.25g 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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