The world is dying; you can help save it. Data Centres consume 2% of all the power in the world and produce about 3% of the greenhouse gases. This is set to treble in the next 10 years. When building apps, we focus on minimising costs, time to market, bugs, bundle size, application speed, SEO, but we spend almost no effort trying to minimise the damage our applications are making to the environment. In this talk we’ll discuss how to write, deploy and run a green sustainable application.