Dezeen Day generated eight tonnes of carbon emissions, according to a "quick and dirty" environmental audit of the conference.
The estimate comes from Sophie Thomas, an environmental designer who attended the day-long conference last month and investigated its environmental impact.
Using a mixture of data from Dezeen, observations made on the day and best estimates, Thomas scored the conference for its environmental performance.
"Having spent the day observing eating habits, talking about how people travelled, talking to the chef and venue managers and poking around the bin store I got a very rough snapshot of the impact of Dezeen Day last week," Thomas said.
"In total, we estimate that over nine hours Dezeen Day generated roughly eight tonnes of CO2e." Sophie Thomas conducted an environmental audit of Dezeen Day
CO2e is carbon dioxide equivalent, which is the standard way of measuring carbon footprints. Different greenhouse gases give different warming effects, so the CO2e standard converts these different impacts into a single measure that represents the amount of CO2 that would cause a similar warming effect.
The carbon footprint of each attendee is therefore 16.4kg CO2e for the nine-hour period, compared to the average UK per-capita figure of 18.5kg CO2e per day. This means that per-capita emissions were roughly three times as high as if they'd not come to the conference.
Thomas added that this calculation is "heavily caveated" si...