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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
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
0.81g CO2 per view
FIX
0.81g CO2 per view
Info::
0.81g CO2 per page view
This page transfers 3.4 MB, producing an estimated 0.81g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.62g.
Got: 0.81g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 97.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 97.4 kg of CO2 annually — equivalent to charging 12172 smartphones.
Info::
Green hosting reduces data center emissions

0.81g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 44% of websites

Sustainable Web Design model v4 · Page size: 3.4 MB

Your site
0.81g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.17g
End-user device
0.62g
At 10,000 monthly views: Monthly: 8.1 kg · Annual: 97.4 kg · ≈ 12172 smartphone charges
D
Carbon Budget
Action
56th percentile
FIX
56th percentile
Warning::
0.81g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.81g

56th percentile

Cleaner than 44% of websites

✗ Above the median website

vs Median 35% more
vs Target 62% 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
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 194 KB (vs 3510 KB first visit). 107 of 108 resources are served from browser cache, saving 0.77g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.81g)
First visit
3510 KB
Repeat visit
194 KB

94% reduction on repeat visits

Saving 0.77g CO2 per returning visitor

107 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
98% efficient
PASS
98% efficient
Info::
Transfer efficiency: 98%
Only 60 KB of potential savings identified. Your page is well-optimized for size.
98% efficient

Total waste: 60 KB (2% of page weight)

Unused JS 60 KB

0.01g unnecessary CO2 per visit

Actual transfer 3510 KB
Theoretical minimum 3450 KB
Potential savings 60 KB (0.01g 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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