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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
69
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
2.52g CO2 per view
FIX
2.52g CO2 per view
Critical::
2.52g CO2 per page view
This page transfers 10.6 MB, producing an estimated 2.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.52g, end-user device 1.93g.
Got: 2.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 301.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 301.8 kg of CO2 annually — equivalent to charging 37729 smartphones.
Info::
Green hosting reduces data center emissions

2.52g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 10.6 MB

Your site
2.52g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.52g
End-user device
1.93g
At 10,000 monthly views: Monthly: 25.2 kg · Annual: 301.8 kg · ≈ 37729 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.52g 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

2.52g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 319% more
vs Target 403% 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 75 KB (vs 10882 KB first visit). 102 of 105 resources are served from browser cache, saving 2.50g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.52g)
First visit
10882 KB
Repeat visit
75 KB

99% reduction on repeat visits

Saving 2.50g CO2 per returning visitor

102 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 861 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 861 KB (8% of page weight)

Unused JS 861 KB

0.20g unnecessary CO2 per visit

Actual transfer 10882 KB
Theoretical minimum 10020 KB
Potential savings 861 KB (0.20g 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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