Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

2 PASS 3 REVIEW 2 FIX

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 HostingNot Green Hosted

Hosting Apache HTTP Server✗CDN Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

53th percentile

FIX

53th percentile

0.71g CO2 — above the median website (0.60g)

Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 53th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

0.71g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 19% more

vs Target 42% more

CO2 Per Page Load

0.71g CO2 per view

REVIEW

0.71g CO2 per view

0.71g CO2 per page view

This page transfers 2.5 MB, producing an estimated 0.71g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.46g.

Got: 0.71g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 85.5 kg CO2/year

With 10,000 page views per month, this page would generate approximately 85.5 kg of CO2 annually — equivalent to charging 10685 smartphones.

0.71g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site

0.71g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.13g

Network

0.12g

End-user device

0.46g

At 10,000 monthly views: Monthly: 7.1 kg · Annual: 85.5 kg · ≈ 10685 smartphone charges

Web Font Weight Variants

Action

12 font weights loaded across 3 famil(y/ies)

REVIEW

12 font weights loaded across 3 famil(y/ies)

12 font weights loaded -- likely 100+ KB of unused payload

Loading 12 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Abel, Bayon, Lato.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 19 KB (vs 2575 KB first visit). 171 of 172 resources are served from browser cache, saving 0.71g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.71g)

First visit

2575 KB

Repeat visit

19 KB

99% reduction on repeat visits

Saving 0.71g CO2 per returning visitor

171 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 2575 KB

Theoretical minimum 2575 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

63 images, 1002 KB total, 13 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

1002 KB

Oversized

Wasted

13 KB

6 missing alt text 57 missing dimensions 56 missing lazy loading

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.