https://earthday.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Checks
64 PASS 1 REVIEW 1 FIX
DCarbon BudgetAction55th percentileFIX
Carbon Budget
Action55th percentile
55th percentile
Warning::
0.80g CO2 — above the median website (0.60g)
Heavier than an estimated 45% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 55th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.80g
55th percentile
Cleaner than 45% of websites
✗ Above the median website
vs Median 33% more
vs Target 59% more
BCO2 Per Page Load0.80g CO2 per viewREVIEW
CO2 Per Page Load
0.80g CO2 per view
0.80g CO2 per view
Info::
0.80g CO2 per page view
This page transfers 3.4 MB, producing an estimated 0.80g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.16g, end-user device 0.61g.
Got: 0.80g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 95.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 95.4 kg of CO2 annually — equivalent to charging 11928 smartphones.
Info::
Green hosting reduces data center emissions
0.80g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 45% of websites
Sustainable Web Design model v4 · Page size: 3.4 MB
Your site
0.80g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.16g
End-user device
0.61g
At 10,000 monthly views: Monthly: 8.0 kg · Annual: 95.4 kg · ≈ 11928 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Kinsta, CDN: Cloudflare
Info::
Kinsta: 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 Kinsta✓CDN Cloudflare✓
Kinsta: 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 Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 73 KB (vs 3440 KB first visit). 166 of 169 resources are served from browser cache, saving 0.78g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.80g)
First visit
3440 KB
Repeat visit
73 KB
98% reduction on repeat visits
Saving 0.78g CO2 per returning visitor
166 resources served from cache · 3 resources re-downloaded
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 211 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 211 KB (6% of page weight)
Unused JS 211 KB
0.05g unnecessary CO2 per visit
Actual transfer 3440 KB
Theoretical minimum 3229 KB
Potential savings 211 KB (0.05g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
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.