London

London has a sterling reputation for environmental stability, ranking as the highest-scoring city among the European cities included in this study. Londons hallmark, however, is its diversity. The U.K. capital has the second-most diverse youth population in the world among those aged 15-29, a measure that includes everything from variety of cultures and food choices to languages to vote in and openness to minorities (which includes minorities based on sexual orientation, religion or immigration).