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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
F
CO2 Per Page Load
Action
1.94g CO2 per view
FIX
1.94g CO2 per view
Warning::
1.94g CO2 per page view
This page transfers 8.2 MB, producing an estimated 1.94g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.40g, end-user device 1.49g.
Got: 1.94g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 233.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 233.1 kg of CO2 annually — equivalent to charging 29134 smartphones.
Info::
Green hosting reduces data center emissions

1.94g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 12% of websites

Sustainable Web Design model v4 · Page size: 8.2 MB

Your site
1.94g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.40g
End-user device
1.49g
At 10,000 monthly views: Monthly: 19.4 kg · Annual: 233.1 kg · ≈ 29134 smartphone charges
F
Carbon Budget
Action
88th percentile
FIX
88th percentile
Warning::
1.94g CO2 — above the median website (0.60g)
Heavier than an estimated 12% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 88th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.94g

88th percentile

Cleaner than 12% of websites

✗ Above the median website

vs Median 224% more
vs Target 288% more
C
Transfer Efficiency
Action
71% efficient
REVIEW
71% efficient
Warning::
Transfer efficiency: 71%
An estimated 2443 KB (29%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 2443 KB of unused JavaScript. This wasted data produces 0.56g of unnecessary CO2 per page view.
71% efficient

Total waste: 2443 KB (29% of page weight)

Unused JS 2443 KB

0.56g unnecessary CO2 per visit

Actual transfer 8403 KB
Theoretical minimum 5960 KB
Potential savings 2443 KB (0.56g 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
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 122 KB (vs 8403 KB first visit). 421 of 431 resources are served from browser cache, saving 1.91g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.94g)
First visit
8403 KB
Repeat visit
122 KB

99% reduction on repeat visits

Saving 1.91g CO2 per returning visitor

421 resources served from cache · 10 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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