https://hackerone.com
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
2
REVIEW
0
PASS
4
INFO
0
Checks
64 PASS 2 FIX
DCO2 Per Page LoadAction1.16g CO2 per viewFIX
CO2 Per Page Load
Action1.16g CO2 per view
1.16g CO2 per view
Warning::
1.16g CO2 per page view
This page transfers 4.9 MB, producing an estimated 1.16g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.24g, end-user device 0.89g.
Got: 1.16g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 139.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 139.2 kg of CO2 annually — equivalent to charging 17401 smartphones.
Info::
Green hosting reduces data center emissions
1.16g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 34% of websites
Sustainable Web Design model v4 · Page size: 4.9 MB
Your site
1.16g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.24g
End-user device
0.89g
At 10,000 monthly views: Monthly: 11.6 kg · Annual: 139.2 kg · ≈ 17401 smartphone charges
DCarbon BudgetAction66th percentileFIX
Carbon Budget
Action66th percentile
66th percentile
Warning::
1.16g CO2 — above the median website (0.60g)
Heavier than an estimated 34% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 66th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.16g
66th percentile
Cleaner than 34% of websites
✗ Above the median website
vs Median 93% more
vs Target 132% more
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: 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 Amazon Web Services✓CDN Cloudflare✓
Amazon Web Services: 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 70 KB (vs 5018 KB first visit). 82 of 84 resources are served from browser cache, saving 1.14g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.16g)
First visit
5018 KB
Repeat visit
70 KB
99% reduction on repeat visits
Saving 1.14g CO2 per returning visitor
82 resources served from cache · 2 resources re-downloaded
A+Transfer Efficiency93% efficientPASS
Transfer Efficiency
93% efficient
93% efficient
Info::
Transfer efficiency: 93%
Only 371 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 371 KB (7% of page weight)
Unused JS 371 KB
0.09g unnecessary CO2 per visit
Actual transfer 5018 KB
Theoretical minimum 4647 KB
Potential savings 371 KB (0.09g 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.