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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
81
GRADE
B
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
8
4 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.84g CO2 per view
FIX
0.84g CO2 per view
Info::
0.84g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.84g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.64g.
Got: 0.84g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 100.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 100.3 kg of CO2 annually — equivalent to charging 12543 smartphones.
Info::
Green hosting reduces data center emissions

0.84g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 44% of websites

Sustainable Web Design model v4 · Page size: 3.5 MB

Your site
0.84g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.17g
End-user device
0.64g
At 10,000 monthly views: Monthly: 8.4 kg · Annual: 100.3 kg · ≈ 12543 smartphone charges
D
Carbon Budget
Action
56th percentile
FIX
56th percentile
Warning::
0.84g CO2 — above the median website (0.60g)
Heavier than an estimated 44% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 56th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.84g

56th percentile

Cleaner than 44% of websites

✗ Above the median website

vs Median 39% more
vs Target 67% more
C
Web Font Weight Variants
Action
10 font weights loaded across 1 famil(y/ies)
REVIEW
10 font weights loaded across 1 famil(y/ies)
Warning::
10 font weights loaded -- likely 100+ KB of unused payload
Loading 10 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: Droid Sans.
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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 16 KB (vs 3617 KB first visit). 87 of 89 resources are served from browser cache, saving 0.83g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.84g)
First visit
3617 KB
Repeat visit
16 KB

100% reduction on repeat visits

Saving 0.83g CO2 per returning visitor

87 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 263 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 263 KB (7% of page weight)

Unused JS 263 KB

0.06g unnecessary CO2 per visit

Actual transfer 3617 KB
Theoretical minimum 3354 KB
Potential savings 263 KB (0.06g 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
24 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

24

Total Size

0 KB

Oversized

3

24 missing dimensions 4 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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