Skip to content
https://giz.de

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
76
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
1.42g CO2 per view
FIX
1.42g CO2 per view
Warning::
1.42g CO2 per page view
This page transfers 6.0 MB, producing an estimated 1.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.29g, end-user device 1.09g.
Got: 1.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 169.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 169.9 kg of CO2 annually — equivalent to charging 21239 smartphones.
Info::
Green hosting reduces data center emissions

1.42g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 27% of websites

Sustainable Web Design model v4 · Page size: 6.0 MB

Your site
1.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.29g
End-user device
1.09g
At 10,000 monthly views: Monthly: 14.2 kg · Annual: 169.9 kg · ≈ 21239 smartphone charges
F
Carbon Budget
Action
73th percentile
FIX
73th percentile
Warning::
1.42g CO2 — above the median website (0.60g)
Heavier than an estimated 27% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 73th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.42g

73rd percentile

Cleaner than 27% of websites

✗ Above the median website

vs Median 136% more
vs Target 183% more
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Hetzner Online GmbH uses renewable energy
Info::
Hetzner Online GmbH: Verified by the Green Web Foundation
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 Hetzner Online GmbH✓CDN Not identified✗

Hetzner Online GmbH: Verified by the Green Web Foundation

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 19 KB (vs 6126 KB first visit). 55 of 56 resources are served from browser cache, saving 1.41g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.42g)
First visit
6126 KB
Repeat visit
19 KB

100% reduction on repeat visits

Saving 1.41g CO2 per returning visitor

55 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
95% efficient
PASS
95% efficient
Info::
Transfer efficiency: 95%
Only 321 KB of potential savings identified. Your page is well-optimized for size.
95% efficient

Total waste: 321 KB (5% of page weight)

Unused JS 321 KB

0.07g unnecessary CO2 per visit

Actual transfer 6126 KB
Theoretical minimum 5805 KB
Potential savings 321 KB (0.07g 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: Hetzner Online GmbH

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback