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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
77
GRADE
C
FIX
1
REVIEW
4
PASS
2
INFO
1
Device:
Mobile Desktop
Checks
8
2 PASS 4 REVIEW 1 FIX
D
Carbon Budget
Action
52th percentile
FIX
52th percentile
Warning::
0.68g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.68g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 14% more
vs Target 36% more
B
CO2 Per Page Load
0.68g CO2 per view
REVIEW
0.68g CO2 per view
Info::
0.68g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.68g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.52g.
Got: 0.68g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 81.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 81.9 kg of CO2 annually — equivalent to charging 10235 smartphones.
Info::
Green hosting reduces data center emissions

0.68g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.9 MB

Your site
0.68g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.14g
End-user device
0.52g
At 10,000 monthly views: Monthly: 6.8 kg · Annual: 81.9 kg · ≈ 10235 smartphone charges
B
Transfer Efficiency
79% efficient
REVIEW
79% efficient
Info::
Transfer efficiency: 79%
An estimated 633 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 633 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
79% efficient

Total waste: 633 KB (21% of page weight)

Unused JS 633 KB

0.15g unnecessary CO2 per visit

Actual transfer 2952 KB
Theoretical minimum 2318 KB
Potential savings 633 KB (0.15g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
38 font weights loaded across 7 famil(y/ies)
REVIEW
38 font weights loaded across 7 famil(y/ies)
Warning::
38 font weights loaded -- likely 100+ KB of unused payload
Loading 38 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Archivo, Google%20Sans%20Text%3A400%2C500, Google%20Sans%20Text%3A400%2C500%2C700, Google%20Sans%3A400, Google%20Sans%3A700, Google%20Symbols%3Aopsz%2Cwght%2CFILL%2CGRAD%4020..48%2C100..700%2C0..1%2C-50..200, Open Sans.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 242 KB (vs 2952 KB first visit). 134 of 143 resources are served from browser cache, saving 0.63g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.68g)
First visit
2952 KB
Repeat visit
242 KB

92% reduction on repeat visits

Saving 0.63g CO2 per returning visitor

134 resources served from cache · 9 resources re-downloaded

Image Optimization
1 images, 2 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

1

Total Size

2 KB

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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