https://lifehacker.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
65
GRADE
D
FIX
2
REVIEW
1
PASS
3
INFO
0
Checks
63 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction2.30g CO2 per viewFIX
CO2 Per Page Load
Action2.30g CO2 per view
2.30g CO2 per view
Critical::
2.30g CO2 per page view
This page transfers 9.7 MB, producing an estimated 2.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.48g, end-user device 1.77g.
Got: 2.30g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 276.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 276.3 kg of CO2 annually — equivalent to charging 34543 smartphones.
Info::
Green hosting reduces data center emissions
2.30g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 5% of websites
Sustainable Web Design model v4 · Page size: 9.7 MB
Your site
2.30g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.06g
Network
0.48g
End-user device
1.77g
At 10,000 monthly views: Monthly: 23.0 kg · Annual: 276.3 kg · ≈ 34543 smartphone charges
FCarbon BudgetAction95th percentileFIX
Carbon Budget
Action95th percentile
95th percentile
Warning::
2.30g 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
2.30g
95th percentile
Cleaner than 5% of websites
✗ Above the median website
vs Median 284% more
vs Target 361% more
BTransfer Efficiency82% efficientREVIEW
Transfer Efficiency
82% efficient
82% efficient
Info::
Transfer efficiency: 82%
An estimated 1794 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1794 KB of unused JavaScript. This wasted data produces 0.41g of unnecessary CO2 per page view.
Total waste: 1794 KB (18% of page weight)
Unused JS 1794 KB
0.41g unnecessary CO2 per visit
Actual transfer 9963 KB
Theoretical minimum 8168 KB
Potential savings 1794 KB (0.41g CO2)
See Deep Analysis sections above for specific optimizations.
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 75 KB (vs 9963 KB first visit). 173 of 176 resources are served from browser cache, saving 2.29g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 2.30g)
First visit
9963 KB
Repeat visit
75 KB
99% reduction on repeat visits
Saving 2.29g CO2 per returning visitor
173 resources served from cache · 3 resources re-downloaded
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.