Sustainability

· 6 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

3 PASS 1 REVIEW 2 FIX

CO2 Per Page Load

Action

1.09g CO2 per view

FIX

1.09g CO2 per view

1.09g CO2 per page view

This page transfers 4.6 MB, producing an estimated 1.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.23g, end-user device 0.84g.

Got: 1.09g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 130.9 kg CO2/year

With 10,000 page views per month, this page would generate approximately 130.9 kg of CO2 annually — equivalent to charging 16367 smartphones.

Green hosting reduces data center emissions

1.09g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 36% of websites

Sustainable Web Design model v4 · Page size: 4.6 MB

Your site

1.09g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.03g

Network

0.23g

End-user device

0.84g

At 10,000 monthly views: Monthly: 10.9 kg · Annual: 130.9 kg · ≈ 16367 smartphone charges

Carbon Budget

Action

64th percentile

FIX

64th percentile

1.09g CO2 — above the median website (0.60g)

Heavier than an estimated 36% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 64th percentile

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

Top 10%

Target

Median website

1.09g

64th percentile

Cleaner than 36% of websites

✗ Above the median website

vs Median 82% more

vs Target 118% more

Transfer Efficiency

Action

61% efficient

REVIEW

61% efficient

Transfer efficiency: 61%

An estimated 1852 KB (39%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1852 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.

Total waste: 1852 KB (39% of page weight)

Unused JS 1852 KB

0.43g unnecessary CO2 per visit

Actual transfer 4720 KB

Theoretical minimum 2868 KB

Potential savings 1852 KB (0.43g CO2)

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Next.js, CDN: Cloudflare

Next.js: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

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 Next.js✓CDN Cloudflare✓

Next.js: 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

99% reduction on repeat visits

Returning visitors download only 42 KB (vs 4720 KB first visit). 113 of 114 resources are served from browser cache, saving 1.08g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 1.09g)

First visit

4720 KB

Repeat visit

42 KB

99% reduction on repeat visits

Saving 1.08g CO2 per returning visitor

113 resources served from cache · 1 resources re-downloaded

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.