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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
71
GRADE
C
FIX
2
REVIEW
1
PASS
4
INFO
1
Device:
Mobile Desktop
Checks
8
4 PASS 1 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.03g CO2 per view
FIX
2.03g CO2 per view
Critical::
2.03g CO2 per page view
This page transfers 8.6 MB, producing an estimated 2.03g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.42g, end-user device 1.56g.
Got: 2.03g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 243.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 243.8 kg of CO2 annually — equivalent to charging 30474 smartphones.
Info::
Green hosting reduces data center emissions

2.03g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.6 MB

Your site
2.03g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.42g
End-user device
1.56g
At 10,000 monthly views: Monthly: 20.3 kg · Annual: 243.8 kg · ≈ 30474 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.03g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.03g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 239% more
vs Target 306% more
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: Bebas Neue, Roboto.
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 109 KB (vs 8789 KB first visit). 262 of 266 resources are served from browser cache, saving 2.01g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 2.03g)
First visit
8789 KB
Repeat visit
109 KB

99% reduction on repeat visits

Saving 2.01g CO2 per returning visitor

262 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 768 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 768 KB (9% of page weight)

Unused JS 768 KB

0.18g unnecessary CO2 per visit

Actual transfer 8789 KB
Theoretical minimum 8020 KB
Potential savings 768 KB (0.18g 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

Image Optimization
200 images, 1910 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

200

Total Size

1910 KB

Oversized

1

9 missing dimensions 140 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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