https://ahrefs.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
69
GRADE
D
FIX
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
FCO2 Per Page LoadAction2.10g CO2 per viewFIX
CO2 Per Page Load
Action2.10g CO2 per view
2.10g CO2 per view
Critical::
2.10g CO2 per page view
This page transfers 8.9 MB, producing an estimated 2.10g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.43g, end-user device 1.61g.
Got: 2.10g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 252.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 252.0 kg of CO2 annually — equivalent to charging 31494 smartphones.
Info::
Green hosting reduces data center emissions
2.10g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 8.9 MB
Your site
2.10g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.05g
Network
0.43g
End-user device
1.61g
At 10,000 monthly views: Monthly: 21.0 kg · Annual: 252.0 kg · ≈ 31494 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.10g 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
2.10g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 250% more
vs Target 320% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 93 KB (vs 9083 KB first visit). 202 of 203 resources are served from browser cache, saving 2.08g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.10g)
First visit
9083 KB
Repeat visit
93 KB
99% reduction on repeat visits
Saving 2.08g CO2 per returning visitor
202 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency96% efficientPASS
Transfer Efficiency
96% efficient
96% efficient
Info::
Transfer efficiency: 96%
Only 345 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 345 KB (4% of page weight)
Unused JS 345 KB
0.08g unnecessary CO2 per visit
Actual transfer 9083 KB
Theoretical minimum 8738 KB
Potential savings 345 KB (0.08g 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.