Switzerland is set for a nail-biter vote on a proposal to cap the population at 10 million, after a two-pronged push by campaigners that paired a polished appeal to sustainability-minded moderates with harsher anti-immigrant messaging. Ahead of the ballot on Sunday, the Swiss People’s Party, or SVP, has cast the initiative as a solution to housing affordability and a defense of the environment, arguing that immigration is forcing the country to pave over its renowned Alpine scenery.