“We are working to very specifically quantify in biophysical and dollar terms the value of conserving the forest and its wildlife,” she said.

In recent years, Dr. Daily has expanded her research to include a global focus. She is one of the pioneers in the growing worldwide effort to protect the environment by quantifying the value of “natural capital” — nature’s goods and services that are fundamental for human life — and factoring these benefits into the calculations of businesses and governments. Dr. Daily’s work has attracted international attention and has earned her some of the world’s most coveted environmental awards.

Part of Dr. Daily’s interest in natural capital emerged from her research in Costa Rica, where she became intrigued with an innovative government initiative known as Payment for Environmental Services. The program, initiated in the 1990s, pays landowners to maintain native forest rather than cut it and has contributed to a significant reduction in Costa Rica’s deforestation rate.

The Costa Rican program helped inspire Dr. Daily to co-found the Natural Capital Project in 2006. NatCap, as the program is known, is a venture led by Stanford University, the University of Minnesota and two of the world’s largest conservation organizations, the Nature Conservancy and the World Wildlife Fund. It aims to transform traditional conservation methods by including the value of “ecosystem services” in business, community and government decisions. These benefits from nature — like flood protection, crop pollination and carbon storage — are not part of the traditional economic equation.

“Currently, there is no price for most of the ecosystem services we care about, like clean air and clean water,” said Stephen Polasky, professor of ecological/environmental economics at the University of Minnesota. He says that because economic calculations often ignore nature, the results can lead to the destruction of the very ecosystems upon which the economy is based.