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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
66
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 2 REVIEW 2 FIX
F
CO2 Per Page Load
Action
2.07g CO2 per view
FIX
2.07g CO2 per view
Critical::
2.07g CO2 per page view
This page transfers 8.7 MB, producing an estimated 2.07g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.43g, end-user device 1.59g.
Got: 2.07g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 248.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 248.4 kg of CO2 annually — equivalent to charging 31051 smartphones.
Info::
Green hosting reduces data center emissions

2.07g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 8.7 MB

Your site
2.07g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.43g
End-user device
1.59g
At 10,000 monthly views: Monthly: 20.7 kg · Annual: 248.4 kg · ≈ 31051 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.07g 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

2.07g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 245% more
vs Target 314% more
C
Web Font Weight Variants
Action
18 font weights loaded across 5 famil(y/ies)
REVIEW
18 font weights loaded across 5 famil(y/ies)
Warning::
18 font weights loaded -- likely 100+ KB of unused payload
Loading 18 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: Fustat, Inter, JetBrains Mono, Newsreader, Outfit.
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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 16 KB (vs 8956 KB first visit). 21 of 22 resources are served from browser cache, saving 2.07g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 2.07g)
First visit
8956 KB
Repeat visit
16 KB

100% reduction on repeat visits

Saving 2.07g CO2 per returning visitor

21 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 8956 KB
Theoretical minimum 8956 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization
7 images, 1871 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

7

Total Size

1871 KB

7 missing dimensions 1 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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