A fifth of Nepal's lands are designated as protected areas.
But both hydropower projects and tourism are major earners, and the government passed laws last year to allow infrastructure projects in national parks, forests and other conservation areas, except in highly sensitive zones.
"The controversial decision was made with deception," environmental advocate Padam Bahadur Shrestha, one of the petitioners challenging the changes to the law, told AFP.
"It clearly shows how our government is working just to appease investors because it lacks farsightedness."
Shrestha said that the verdict, which was issued on Wednesday, offers "justice to preserve ecology and biodiversity".
Kathmandu has been praised worldwide for its efforts to protect wildlife, allowing it to bring several species back from the brink of local extinction, including tigers and rhinos.
Nepal's protected habitat laws have helped to triple its tiger population to 355 since 2010 and to increase one-horned rhinoceros from around 100 in the 1960s to 752 in 2021.
After decades of rampant logging, Nepal also nearly doubled its forest cover between 1992 and 2016.
"The laws should have never been passed," said Rampreet Yadav, former chief conservation officer of Chitwan National Park, Nepal's most important conservation area.
"If development projects are allowed in protected areas, it will destroy our nature, it will destroy the habitats of animals."
Nepal is eager to develop its hydropower industry after a dam-building spree in the past two decades that has given it an installed capacity of more than 2,600 megawatts.
It signed deals with India and Bangladesh last year to export thousands of megawatts of hydroelectricity.
Tourism is also a major earner for Nepal, which saw a million foreign visitors last year after a post-pandemic bounceback, with the government pumping investments into infrastructure including airports.
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