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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
80
GRADE
B
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.02g CO2 per view
FIX
1.02g CO2 per view
Warning::
1.02g CO2 per page view
This page transfers 4.3 MB, producing an estimated 1.02g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.79g.
Got: 1.02g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 122.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 122.9 kg of CO2 annually — equivalent to charging 15365 smartphones.
Info::
Green hosting reduces data center emissions

1.02g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 38% of websites

Sustainable Web Design model v4 · Page size: 4.3 MB

Your site
1.02g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.21g
End-user device
0.79g
At 10,000 monthly views: Monthly: 10.2 kg · Annual: 122.9 kg · ≈ 15365 smartphone charges
D
Carbon Budget
Action
62th percentile
FIX
62th percentile
Warning::
1.02g CO2 — above the median website (0.60g)
Heavier than an estimated 38% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 62th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.02g

62nd percentile

Cleaner than 38% of websites

✗ Above the median website

vs Median 71% more
vs Target 105% 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
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 132 KB (vs 4431 KB first visit). 113 of 115 resources are served from browser cache, saving 0.99g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.02g)
First visit
4431 KB
Repeat visit
132 KB

97% reduction on repeat visits

Saving 0.99g CO2 per returning visitor

113 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 369 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 369 KB (8% of page weight)

Unused JS 369 KB

0.09g unnecessary CO2 per visit

Actual transfer 4431 KB
Theoretical minimum 4062 KB
Potential savings 369 KB (0.09g 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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