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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
77
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.26g CO2 per view
FIX
1.26g CO2 per view
Warning::
1.26g CO2 per page view
This page transfers 5.3 MB, producing an estimated 1.26g 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: 1.26g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 150.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 150.7 kg of CO2 annually — equivalent to charging 18832 smartphones.
Info::
Green hosting reduces data center emissions

1.26g

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
1.26g
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: 12.6 kg · Annual: 150.7 kg · ≈ 18832 smartphone charges
D
Carbon Budget
Action
68th percentile
FIX
68th percentile
Warning::
1.26g 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

1.26g

68th percentile

Cleaner than 32% of websites

✗ Above the median website

vs Median 109% more
vs Target 151% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
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 Azure✗CDN Cloudflare✓

Azure: Microsoft is carbon-negative; Azure renewable varies by region

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 22 KB (vs 5431 KB first visit). 110 of 112 resources are served from browser cache, saving 1.25g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.26g)
First visit
5431 KB
Repeat visit
22 KB

100% reduction on repeat visits

Saving 1.25g CO2 per returning visitor

110 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 337 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 337 KB (6% of page weight)

Unused JS 337 KB

0.08g unnecessary CO2 per visit

Actual transfer 5431 KB
Theoretical minimum 5094 KB
Potential savings 337 KB (0.08g CO2)

See Deep Analysis sections above for specific optimizations.

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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