Measures changing the order of magnitude are decided at the design stage. A well-designed hybrid format, in person for nearby participants and remote for those who would have flown, cuts the footprint by 40 to 60%. Choosing a venue served by high-speed rail accounts for 30 to 40%, and rail incentives (group fares, a ticket included in registration) deliver 10 to 20% modal shift. Next come vegetarian catering by default, saving 2 to 3 tCO2e for 500 people and 4 meals, then reduced materials: reusable badges and signage, and removing giveaways.
Read the source article: An event's Bilan Carbone®: categories, figures and measures