Skip to content
https://glossier.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
76
GRADE
C
FIX
2
REVIEW
0
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 FIX
F
CO2 Per Page Load
Action
3.49g CO2 per view
FIX
3.49g CO2 per view
Critical::
3.49g CO2 per page view
This page transfers 14.7 MB, producing an estimated 3.49g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.72g, end-user device 2.68g.
Got: 3.49g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 418.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 418.5 kg of CO2 annually — equivalent to charging 52316 smartphones.
Info::
Green hosting reduces data center emissions

3.49g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 14.7 MB

Your site
3.49g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.72g
End-user device
2.68g
At 10,000 monthly views: Monthly: 34.9 kg · Annual: 418.5 kg · ≈ 52316 smartphone charges
F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
3.49g 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

3.49g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 481% more
vs Target 598% more
A+
Green Hosting
Green (both)
PASS
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 Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 160 KB (vs 15089 KB first visit). 342 of 350 resources are served from browser cache, saving 3.45g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 3.49g)
First visit
15089 KB
Repeat visit
160 KB

99% reduction on repeat visits

Saving 3.45g CO2 per returning visitor

342 resources served from cache · 8 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 1008 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 1008 KB (7% of page weight)

Unused JS 1008 KB

0.23g unnecessary CO2 per visit

Actual transfer 15089 KB
Theoretical minimum 14080 KB
Potential savings 1008 KB (0.23g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

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.

Send Feedback