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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
66
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
10.53g CO2 per view
FIX
10.53g CO2 per view
Critical::
10.53g CO2 per page view
This page transfers 44.5 MB, producing an estimated 10.53g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.26g, network 2.18g, end-user device 8.09g.
Got: 10.53g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 1263.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 1263.3 kg of CO2 annually — equivalent to charging 157906 smartphones.
Info::
Green hosting reduces data center emissions

10.53g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 44.5 MB

Your site
10.53g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.26g
Network
2.18g
End-user device
8.09g
At 10,000 monthly views: Monthly: 105.3 kg · Annual: 1263.3 kg · ≈ 157906 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
10.53g 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

10.53g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 1655% more
vs Target 2005% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Cloudflare✓

Amazon Web Services: 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 23 KB (vs 45544 KB first visit). 161 of 165 resources are served from browser cache, saving 10.52g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 10.53g)
First visit
45544 KB
Repeat visit
23 KB

100% reduction on repeat visits

Saving 10.52g CO2 per returning visitor

161 resources served from cache · 4 resources re-downloaded

A+
Transfer Efficiency
99% efficient
PASS
99% efficient
Info::
Transfer efficiency: 99%
Only 529 KB of potential savings identified. Your page is well-optimized for size.
99% efficient

Total waste: 529 KB (1% of page weight)

Unused JS 529 KB

0.12g unnecessary CO2 per visit

Actual transfer 45544 KB
Theoretical minimum 45014 KB
Potential savings 529 KB (0.12g 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

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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