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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
0.96g CO2 per view
FIX
0.96g CO2 per view
Info::
0.96g CO2 per page view
This page transfers 4.1 MB, producing an estimated 0.96g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.74g.
Got: 0.96g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 115.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 115.1 kg of CO2 annually — equivalent to charging 14392 smartphones.
Info::
Green hosting reduces data center emissions

0.96g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 4.1 MB

Your site
0.96g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.20g
End-user device
0.74g
At 10,000 monthly views: Monthly: 9.6 kg · Annual: 115.1 kg · ≈ 14392 smartphone charges
D
Carbon Budget
Action
60th percentile
FIX
60th percentile
Warning::
0.96g CO2 — above the median website (0.60g)
Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 60th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.96g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 60% more
vs Target 92% 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 110 KB (vs 4151 KB first visit). 117 of 122 resources are served from browser cache, saving 0.93g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.96g)
First visit
4151 KB
Repeat visit
110 KB

97% reduction on repeat visits

Saving 0.93g CO2 per returning visitor

117 resources served from cache · 5 resources re-downloaded

A+
Transfer Efficiency
90% efficient
PASS
90% efficient
Info::
Transfer efficiency: 90%
Only 401 KB of potential savings identified. Your page is well-optimized for size.
90% efficient

Total waste: 401 KB (10% of page weight)

Unused JS 401 KB

0.09g unnecessary CO2 per visit

Actual transfer 4151 KB
Theoretical minimum 3749 KB
Potential savings 401 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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