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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
94
GRADE
A
FIX
0
REVIEW
0
PASS
6
INFO
0
Device:
Mobile Desktop
Checks
6
6 PASS
A
CO2 Per Page Load
0.34g CO2 per view
PASS
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.4 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.26g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 40.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 40.9 kg of CO2 annually — equivalent to charging 5118 smartphones.
Info::
Green hosting reduces data center emissions

0.34g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 76% of websites

Sustainable Web Design model v4 · Page size: 1.4 MB

Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.07g
End-user device
0.26g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 40.9 kg · ≈ 5118 smartphone charges
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
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 138 KB (vs 1476 KB first visit). 36 of 37 resources are served from browser cache, saving 0.31g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.34g)
First visit
1476 KB
Repeat visit
138 KB

91% reduction on repeat visits

Saving 0.31g CO2 per returning visitor

36 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
24th percentile
PASS
24th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.34g

24th percentile

Cleaner than 76% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 43% cleaner ✓
vs Target 32% cleaner ✓
A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 104 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 104 KB (7% of page weight)

Unused JS 104 KB

0.02g unnecessary CO2 per visit

Actual transfer 1476 KB
Theoretical minimum 1371 KB
Potential savings 104 KB (0.02g 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: 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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