https://umbc.edu
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
87
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 249 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 249 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.
Total waste: 249 KB (14% of page weight)
Unused JS 249 KB
0.06g unnecessary CO2 per visit
Actual transfer 1723 KB
Theoretical minimum 1473 KB
Potential savings 249 KB (0.06g CO2)
See Deep Analysis sections above for specific optimizations.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
ACO2 Per Page Load0.40g CO2 per viewPASS
CO2 Per Page Load
0.40g CO2 per view
0.40g CO2 per view
Info::
0.40g CO2 per page view
This page transfers 1.7 MB, producing an estimated 0.40g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.31g.
Got: 0.40g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 47.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 47.8 kg of CO2 annually — equivalent to charging 5975 smartphones.
Info::
Green hosting reduces data center emissions
0.40g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 71% of websites
Sustainable Web Design model v4 · Page size: 1.7 MB
Your site
0.40g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.08g
End-user device
0.31g
At 10,000 monthly views: Monthly: 4.0 kg · Annual: 47.8 kg · ≈ 5975 smartphone charges
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Fastly CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Fastly: 100% renewable energy for edge network
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 Fastly✓
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 84 KB (vs 1723 KB first visit). 74 of 75 resources are served from browser cache, saving 0.38g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.40g)
First visit
1723 KB
Repeat visit
84 KB
95% reduction on repeat visits
Saving 0.38g CO2 per returning visitor
74 resources served from cache · 1 resources re-downloaded
ACarbon Budget29th percentilePASS
Carbon Budget
29th percentile
29th percentile
Info::
0.40g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 71% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 29th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.40g
29th percentile
Cleaner than 71% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 34% cleaner ✓
vs Target 20% cleaner ✓
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.