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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
68
GRADE
D
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
1.48g CO2 per view
FIX
1.48g CO2 per view
Warning::
1.48g CO2 per page view
This page transfers 6.2 MB, producing an estimated 1.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.31g, end-user device 1.13g.
Got: 1.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 177.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 177.3 kg of CO2 annually — equivalent to charging 22162 smartphones.
Info::
Green hosting reduces data center emissions

1.48g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 25% of websites

Sustainable Web Design model v4 · Page size: 6.2 MB

Your site
1.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.31g
End-user device
1.13g
At 10,000 monthly views: Monthly: 14.8 kg · Annual: 177.3 kg · ≈ 22162 smartphone charges
F
Carbon Budget
Action
75th percentile
FIX
75th percentile
Warning::
1.48g 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

1.48g

75th percentile

Cleaner than 25% of websites

✗ Above the median website

vs Median 146% more
vs Target 195% more
C
Transfer Efficiency
Action
69% efficient
REVIEW
69% efficient
Warning::
Transfer efficiency: 69%
An estimated 1996 KB (31%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1996 KB of unused JavaScript. This wasted data produces 0.46g of unnecessary CO2 per page view.
69% efficient

Total waste: 1996 KB (31% of page weight)

Unused JS 1996 KB

0.46g unnecessary CO2 per visit

Actual transfer 6392 KB
Theoretical minimum 4396 KB
Potential savings 1996 KB (0.46g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Google Cloud, CDN: Cloudflare
Info::
Google Cloud: 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 Google Cloud✓CDN Cloudflare✓

Google Cloud: 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
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 123 KB (vs 6392 KB first visit). 354 of 365 resources are served from browser cache, saving 1.45g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.48g)
First visit
6392 KB
Repeat visit
123 KB

98% reduction on repeat visits

Saving 1.45g CO2 per returning visitor

354 resources served from cache · 11 resources re-downloaded

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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