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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
74
GRADE
C
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
D
CO2 Per Page Load
Action
1.29g CO2 per view
FIX
1.29g CO2 per view
Warning::
1.29g CO2 per page view
This page transfers 5.4 MB, producing an estimated 1.29g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.27g, end-user device 0.99g.
Got: 1.29g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 154.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 154.5 kg of CO2 annually — equivalent to charging 19308 smartphones.
Info::
Green hosting reduces data center emissions

1.29g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 31% of websites

Sustainable Web Design model v4 · Page size: 5.4 MB

Your site
1.29g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.27g
End-user device
0.99g
At 10,000 monthly views: Monthly: 12.9 kg · Annual: 154.5 kg · ≈ 19308 smartphone charges
D
Carbon Budget
Action
69th percentile
FIX
69th percentile
Warning::
1.29g CO2 — above the median website (0.60g)
Heavier than an estimated 31% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 69th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.29g

69th percentile

Cleaner than 31% of websites

✗ Above the median website

vs Median 115% more
vs Target 157% more
C
Transfer Efficiency
Action
71% efficient
REVIEW
71% efficient
Warning::
Transfer efficiency: 71%
An estimated 1626 KB (29%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1626 KB of unused JavaScript. This wasted data produces 0.38g of unnecessary CO2 per page view.
71% efficient

Total waste: 1626 KB (29% of page weight)

Unused JS 1626 KB

0.38g unnecessary CO2 per visit

Actual transfer 5569 KB
Theoretical minimum 3942 KB
Potential savings 1626 KB (0.38g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
5 font weights loaded across 2 famil(y/ies)
REVIEW
5 font weights loaded across 2 famil(y/ies)
Info::
5 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Roboto, Roboto%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic%7CRoboto Slab%3A100%2C100italic%2C200%2C200italic%2C300%2C300italic%2C400%2C400italic%2C500%2C500italic%2C600%2C600italic%2C700%2C700italic%2C800%2C800italic%2C900%2C900italic.
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓

Cloudflare: 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 44 KB (vs 5569 KB first visit). 243 of 249 resources are served from browser cache, saving 1.28g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.29g)
First visit
5569 KB
Repeat visit
44 KB

99% reduction on repeat visits

Saving 1.28g CO2 per returning visitor

243 resources served from cache · 6 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

Image Optimization
60 images, 8 KB total, 6 KB wasted
INFO

Image Optimization Audit

Total Images

60

Total Size

8 KB

Oversized

8

Wasted

6 KB

4 missing alt text 56 missing dimensions 51 missing lazy loading
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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