Skip to content
https://iadb.org

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
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
D
CO2 Per Page Load
Action
1.36g CO2 per view
FIX
1.36g CO2 per view
Warning::
1.36g CO2 per page view
This page transfers 5.7 MB, producing an estimated 1.36g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.28g, end-user device 1.04g.
Got: 1.36g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 162.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 162.9 kg of CO2 annually — equivalent to charging 20367 smartphones.
Info::
Green hosting reduces data center emissions

1.36g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 29% of websites

Sustainable Web Design model v4 · Page size: 5.7 MB

Your site
1.36g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.28g
End-user device
1.04g
At 10,000 monthly views: Monthly: 13.6 kg · Annual: 162.9 kg · ≈ 20367 smartphone charges
F
Carbon Budget
Action
71th percentile
FIX
71th percentile
Warning::
1.36g CO2 — above the median website (0.60g)
Heavier than an estimated 29% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 71th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.36g

71st percentile

Cleaner than 29% of websites

✗ Above the median website

vs Median 126% more
vs Target 172% more
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Pantheon, CDN: Cloudflare
Info::
Pantheon: 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 Pantheon✓CDN Cloudflare✓

Pantheon: 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 15 KB (vs 5874 KB first visit). 80 of 82 resources are served from browser cache, saving 1.35g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.36g)
First visit
5874 KB
Repeat visit
15 KB

100% reduction on repeat visits

Saving 1.35g CO2 per returning visitor

80 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 426 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 426 KB (7% of page weight)

Unused JS 426 KB

0.10g unnecessary CO2 per visit

Actual transfer 5874 KB
Theoretical minimum 5447 KB
Potential savings 426 KB (0.10g 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.

Send Feedback