Not long ago, monarchs numbered in the billions, but in the last 20 years their population has dropped by 90%, due to habitat loss from pesticides, GMO farming practices, development and other human activity. An estimated one million acres of habitat are lost each year.But today, an army of citizen-scientists, students and gardeners is engaged in restoring this beloved pollinator’s habitat – the wildflowers and milkweed and feeding corridors – so that one of nature’s most beautiful creatures...