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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
F
CO2 Per Page Load
Action
1.51g CO2 per view
FIX
1.51g CO2 per view
Warning::
1.51g CO2 per page view
This page transfers 6.4 MB, producing an estimated 1.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.31g, end-user device 1.16g.
Got: 1.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 181.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 181.1 kg of CO2 annually — equivalent to charging 22637 smartphones.
Info::
Green hosting reduces data center emissions

1.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 25% of websites

Sustainable Web Design model v4 · Page size: 6.4 MB

Your site
1.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.31g
End-user device
1.16g
At 10,000 monthly views: Monthly: 15.1 kg · Annual: 181.1 kg · ≈ 22637 smartphone charges
F
Carbon Budget
Action
75th percentile
FIX
75th percentile
Warning::
1.51g CO2 — above the median website (0.60g)
Heavier than an estimated 25% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 75th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.51g

75th percentile

Cleaner than 25% of websites

✗ Above the median website

vs Median 152% more
vs Target 202% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Fastly
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓

Google Cloud: Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 314 KB (vs 6529 KB first visit). 316 of 317 resources are served from browser cache, saving 1.44g CO2 per repeat visit.
Info::
Repeat visit: 0.07g CO2 (first visit: 1.51g)
First visit
6529 KB
Repeat visit
314 KB

95% reduction on repeat visits

Saving 1.44g CO2 per returning visitor

316 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
97% efficient
PASS
97% efficient
Info::
Transfer efficiency: 97%
Only 174 KB of potential savings identified. Your page is well-optimized for size.
97% efficient

Total waste: 174 KB (3% of page weight)

Unused JS 174 KB

0.04g unnecessary CO2 per visit

Actual transfer 6529 KB
Theoretical minimum 6354 KB
Potential savings 174 KB (0.04g 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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