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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
72
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 FIX
D
CO2 Per Page Load
Action
0.82g CO2 per view
FIX
0.82g CO2 per view
Info::
0.82g CO2 per page view
This page transfers 3.5 MB, producing an estimated 0.82g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.17g, end-user device 0.63g.
Got: 0.82g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 98.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 98.7 kg of CO2 annually — equivalent to charging 12340 smartphones.
Info::
Green hosting reduces data center emissions

0.82g

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
0.82g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.17g
End-user device
0.63g
At 10,000 monthly views: Monthly: 8.2 kg · Annual: 98.7 kg · ≈ 12340 smartphone charges
D
Carbon Budget
Action
56th percentile
FIX
56th percentile
Warning::
0.82g 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

0.82g

56th percentile

Cleaner than 44% of websites

✗ Above the median website

vs Median 37% more
vs Target 65% more
C
Transfer Efficiency
Action
65% efficient
REVIEW
65% efficient
Warning::
Transfer efficiency: 65%
An estimated 1238 KB (35%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1238 KB of unused JavaScript. This wasted data produces 0.29g of unnecessary CO2 per page view.
65% efficient

Total waste: 1238 KB (35% of page weight)

Unused JS 1238 KB

0.29g unnecessary CO2 per visit

Actual transfer 3559 KB
Theoretical minimum 2320 KB
Potential savings 1238 KB (0.29g CO2)

See Deep Analysis sections above for specific optimizations.

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
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 145 KB (vs 3559 KB first visit). 100 of 106 resources are served from browser cache, saving 0.79g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.82g)
First visit
3559 KB
Repeat visit
145 KB

96% reduction on repeat visits

Saving 0.79g CO2 per returning visitor

100 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

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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