Did you know that about 250 000 websites are published every day? The majority use too heavy fonts, and unnecessary images or utilize redundant libraries generating a carbon footprint.ec0lint is a tool for front-end developers that mitigates the carbon footprint of websites by showing tips on how to create a more climate-friendly code. Thanks to code optimization ec0lint can help in reducing emissions from 4.6 g to ~0.2 g per one view saving 529 kg CO2 for each website (-96%!) annually. In the keynote, I will share what digital ecology is and give you tips and tricks on how to mitigate your digital footprint. I am also planning on sharing information about the tool we created – how it works, what factors exactly lead to the generation of carbon footprint, what are some of the features we coded, how the C02 calculator works, and how anyone can contribute.