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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
1.76g CO2 per view
FIX
1.76g CO2 per view
Warning::
1.76g CO2 per page view
This page transfers 7.4 MB, producing an estimated 1.76g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.36g, end-user device 1.35g.
Got: 1.76g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 210.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 210.7 kg of CO2 annually — equivalent to charging 26340 smartphones.
Info::
Green hosting reduces data center emissions

1.76g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 17% of websites

Sustainable Web Design model v4 · Page size: 7.4 MB

Your site
1.76g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.36g
End-user device
1.35g
At 10,000 monthly views: Monthly: 17.6 kg · Annual: 210.7 kg · ≈ 26340 smartphone charges
F
Carbon Budget
Action
83th percentile
FIX
83th percentile
Warning::
1.76g CO2 — above the median website (0.60g)
Heavier than an estimated 17% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 83th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.76g

83rd percentile

Cleaner than 17% of websites

✗ Above the median website

vs Median 193% more
vs Target 251% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 821 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 821 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
89% efficient

Total waste: 821 KB (11% of page weight)

Unused JS 821 KB

0.19g unnecessary CO2 per visit

Actual transfer 7597 KB
Theoretical minimum 6775 KB
Potential savings 821 KB (0.19g 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 15 KB (vs 7597 KB first visit). 44 of 46 resources are served from browser cache, saving 1.75g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.76g)
First visit
7597 KB
Repeat visit
15 KB

100% reduction on repeat visits

Saving 1.75g CO2 per returning visitor

44 resources served from cache · 2 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: Cloudflare

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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