Plan aimed to expand protection of endangered ecosystems, but opponents said it posed risk to business development

Voters in Switzerland have rejected a proposal to make authorities do more to protect natural habitats from pollution and development, preliminary results of a referendum have showed.

The biodiversity initiative, which the Swiss government and parliament had already rebuffed, envisaged changing the law to set aside more land for conservation beyond areas that were already protected.

The initiative has been closely watched by conservationists outside Switzerland, at a time when concerns about global loss of biodiversity are growing. The proposal also intended to increase protections for endangered ecosystems in a country renowned for its lakes and snow-capped mountains.

In one of Switzerland’s traditional exercises of direct democracy, more than 60% of voters rejected the plan, according to a projected result published by the national broadcaster SRF. By mid-afternoon, the initiative had been rejected by too many cantons to pass, an official tally showed.