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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
Checks
6
3 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
1.65g CO2 per view
FIX
1.65g CO2 per view
Warning::
1.65g CO2 per page view
This page transfers 7.0 MB, producing an estimated 1.65g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.34g, end-user device 1.27g.
Got: 1.65g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 198.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 198.1 kg of CO2 annually — equivalent to charging 24761 smartphones.
Info::
Green hosting reduces data center emissions

1.65g

Carbon Footprint per page view

Above sustainability target (0.50g)

Cleaner than 20% of websites

Sustainable Web Design model v4 · Page size: 7.0 MB

Your site
1.65g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.34g
End-user device
1.27g
At 10,000 monthly views: Monthly: 16.5 kg · Annual: 198.1 kg · ≈ 24761 smartphone charges
F
Carbon Budget
Action
80th percentile
FIX
80th percentile
Warning::
1.65g CO2 — above the median website (0.60g)
Heavier than an estimated 20% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 80th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.65g

80th percentile

Cleaner than 20% of websites

Above the median website

vs Median 175% more
vs Target 230% more
B
Transfer Efficiency
88% efficient
REVIEW
88% efficient
Info::
Transfer efficiency: 88%
An estimated 822 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 822 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
88% efficient

Total waste: 822 KB (12% of page weight)

Unused JS 822 KB

0.19g unnecessary CO2 per visit

Actual transfer 7141 KB
Theoretical minimum 6319 KB
Potential savings 822 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 CloudCDN 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 16 KB (vs 7141 KB first visit). 43 of 45 resources are served from browser cache, saving 1.65g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.65g)
First visit
7141 KB
Repeat visit
16 KB

100% reduction on repeat visits

Saving 1.65g CO2 per returning visitor

43 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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