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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
76
GRADE
C
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.25g CO2 per view
FIX
1.25g CO2 per view
Warning::
1.25g CO2 per page view
This page transfers 5.3 MB, producing an estimated 1.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.26g, end-user device 0.96g.
Got: 1.25g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 149.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 149.9 kg of CO2 annually — equivalent to charging 18731 smartphones.
Info::
Green hosting reduces data center emissions

1.25g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 32% of websites

Sustainable Web Design model v4 · Page size: 5.3 MB

Your site
1.25g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.26g
End-user device
0.96g
At 10,000 monthly views: Monthly: 12.5 kg · Annual: 149.9 kg · ≈ 18731 smartphone charges
D
Carbon Budget
Action
68th percentile
FIX
68th percentile
Warning::
1.25g CO2 — above the median website (0.60g)
Heavier than an estimated 32% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 68th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.25g

68th percentile

Cleaner than 32% of websites

✗ Above the median website

vs Median 108% more
vs Target 150% 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 18 KB (vs 5402 KB first visit). 179 of 183 resources are served from browser cache, saving 1.24g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.25g)
First visit
5402 KB
Repeat visit
18 KB

100% reduction on repeat visits

Saving 1.24g CO2 per returning visitor

179 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
90% efficient
PASS
90% efficient
Info::
Transfer efficiency: 90%
Only 530 KB of potential savings identified. Your page is well-optimized for size.
90% efficient

Total waste: 530 KB (10% of page weight)

Unused JS 530 KB

0.12g unnecessary CO2 per visit

Actual transfer 5402 KB
Theoretical minimum 4872 KB
Potential savings 530 KB (0.12g 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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