Turnout declined from the previous election to about 46.4 percent, a change that analysts attributed to weaker participation by the Swiss People’s Party base. Official results are expected Wednesday, but analysts expressed confidence that the projections would hold.

Switzerland’s political system is geared to promoting compromise, and the country’s seven portfolios are currently shared by the four main parties of the outgoing Parliament: the Swiss People’s Party, the center-left Social Democrats and by two center-right parties, the Christian Democrats and the Liberals.

On the basis of the numbers on Sunday night, the Green Party president, Regula Rytz, suggested the party would seek a change in the formula that distributes the seven seats on the ruling Federal Council.

Although the Swiss People’s Party followed a familiar playbook of anti-migrant and anti-European Union rhetoric ahead of the vote, the campaign was dominated by concerns over the dramatic effects of global warming on Switzerland.

Those concerns were partly prompted by environmental protests, some led by the young Swedish activist Greta Thunberg. Dozens of climate activists last month staged a funeral on the rapidly melting Pizol glacier and at least 100,000 joined a rally in the capital, Bern, in September.

Even in conservative Seelisberg , a picture-postcard Alpine village that reflects Switzerland’s tradition of independence, some now say the Swiss People’s Party is out of step with the times, economically and environmentally.

“They want to pull everyone back to the mountains,” said Hans Aschwanden, a local cheese maker whose family has lived in the area for at least 400 years and who represents hundreds of members of a national cheese association. Its members have profited from easy access to European markets, he said. “We don’t want to go back to that,” he added, referring to a more isolated past.