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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
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
1.87g CO2 per view
FIX
1.87g CO2 per view
Warning::
1.87g CO2 per page view
This page transfers 7.9 MB, producing an estimated 1.87g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.39g, end-user device 1.43g.
Got: 1.87g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 224.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 224.1 kg of CO2 annually — equivalent to charging 28013 smartphones.
Info::
Green hosting reduces data center emissions

1.87g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 14% of websites

Sustainable Web Design model v4 · Page size: 7.9 MB

Your site
1.87g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.39g
End-user device
1.43g
At 10,000 monthly views: Monthly: 18.7 kg · Annual: 224.1 kg · ≈ 28013 smartphone charges
F
Carbon Budget
Action
86th percentile
FIX
86th percentile
Warning::
1.87g CO2 — above the median website (0.60g)
Heavier than an estimated 14% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 86th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.87g

86th percentile

Cleaner than 14% of websites

✗ Above the median website

vs Median 211% more
vs Target 274% 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 85 KB (vs 8079 KB first visit). 176 of 178 resources are served from browser cache, saving 1.85g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.87g)
First visit
8079 KB
Repeat visit
85 KB

99% reduction on repeat visits

Saving 1.85g CO2 per returning visitor

176 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 716 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 716 KB (9% of page weight)

Unused JS 716 KB

0.17g unnecessary CO2 per visit

Actual transfer 8079 KB
Theoretical minimum 7363 KB
Potential savings 716 KB (0.17g 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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