The costs in 2050

• $ trillions per year
• 19% loss to world economy

IT’s contribution

IT’s contribution

• Datacenters: ±1% of global CO₂
• Datacenters: ±1-1.5% of global energy
• Networking: ±1-1.5% of global energy

IT’s contribution

• Datacenters: ±1% of global CO₂
• Datacenters: ±1-1.5% of global energy
• Networking: ±1-1.5% of global energy

…and growing

Jan Ouwens

│ EqualsVerifier │ jqno.nl │ 🦋jqno.nl

Personal things

I’m not perfect 😢

Personal things

Google

Personal things

Google

Personal things

My place in this

My place in this

“640k ought to be enough for everyone”

My place in this

My place in this

Oulipo

Constraints

Moore’s law

1. Machines got faster
2. Constraints got thrown out
3. Software got slower!?

Economic model of green software

Stop chasing nines

Stop chasing nines

99.9% uptime

Stop chasing nines

99.99% uptime

Stop chasing nines

99.999% uptime

Stop chasing nines

99.999% uptime ??

Stop chasing nines

← Monday

Sunday →

Stop chasing nines

Stop chasing nines

Stop chasing nines

Stop chasing nines

Stop chasing nines

Stop chasing nines

Re-think your DB

Re-think your DB

Re-think your DB

SQLite is

• Stable
• Reliable
• Backward-compatible
• Billions(!) of deploys

Re-think your DB

Re-think your DB

Re-think your DB

Re-think your DB

Cons:

• Must carefully tweak defaults
• Only one concurrent write
• Must arrange for backups

Re-think your DB

Pros:

• No DB server
• Simplicity

Re-think your DB

Make small Docker images

Make small Docker images

• Need to be stored
     ↳ embedded CO₂
• Need to be transmitted
     ↳ actual CO₂

Make small Docker images

public class Main {
    public static void main(String...args) {
        System.out.println("Hello World!");
    }
}

↓

Make small Docker images

Make small Docker images

Make small Docker images

Make small Docker images

Make small Docker images

Make small Docker images

Make small Docker images

still…

16MB     >     64KB

Make small Docker images

Enable build caching

Enable build caching

Enable build caching

Enable build caching

Enable build caching

Enable build caching

Economic model of green software

Results

• 🤑 Our bosses
• 🚀 Our software
• 💚 The world
• 🥳 Us