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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
2
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.85g CO2 per view
FIX
0.85g CO2 per view
Info::
0.85g CO2 per page view
This page transfers 3.6 MB, producing an estimated 0.85g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.18g, end-user device 0.66g.
Got: 0.85g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 102.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 102.4 kg of CO2 annually — equivalent to charging 12797 smartphones.
Info::
Green hosting reduces data center emissions

0.85g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 43% of websites

Sustainable Web Design model v4 · Page size: 3.6 MB

Your site
0.85g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.18g
End-user device
0.66g
At 10,000 monthly views: Monthly: 8.5 kg · Annual: 102.4 kg · ≈ 12797 smartphone charges
D
Carbon Budget
Action
57th percentile
FIX
57th percentile
Warning::
0.85g CO2 — above the median website (0.60g)
Heavier than an estimated 43% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 57th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.85g

57th percentile

Cleaner than 43% of websites

✗ Above the median website

vs Median 42% more
vs Target 71% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Google Cloud✓CDN Google Cloud CDN✗

Google Cloud: Verified by the Green Web Foundation

Google Cloud CDN: Inherits Google Cloud regional renewable mix

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Repeat Visit Weight
80% cached
REVIEW
80% cached
Info::
80% reduction on repeat visits
Returning visitors download only 739 KB (vs 3691 KB first visit). 151 of 158 resources are served from browser cache, saving 0.68g CO2 per repeat visit.
Info::
Repeat visit: 0.17g CO2 (first visit: 0.85g)
First visit
3691 KB
Repeat visit
739 KB

80% reduction on repeat visits

Saving 0.68g CO2 per returning visitor

151 resources served from cache · 7 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 287 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 287 KB (8% of page weight)

Unused JS 287 KB

0.07g unnecessary CO2 per visit

Actual transfer 3691 KB
Theoretical minimum 3404 KB
Potential savings 287 KB (0.07g 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: Google Cloud

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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