In a not-too-distant future, the once-picturesque city of Lucerne (Switzerland) has become uninhabitable due to the climate crisis. Beginning in an abandoned kitchen, the scope of the change is revealed on an ever-increasing scale until finally, the dried-up Lake Lucerne can be seen.

3.5% is a hybrid of computer animation and live action. The audio features excerpts from interviews with climate activist Greta Thunberg.