Irvington high school was officially awarded the title on Friday.
The school will get a $200,000 hybrid school bus, and the student who submitted the winning application will get a $5,000 scholarship.
More than 760 schools submitted applications. Irvington students say today's honor is a group effort.
"This award, in reality, represents everyone's dedication to the green movement," said Irvington High student Jasper Lin.
Irvington High School has reduced its energy consumption by 33 percent since 2006, and takes part in a food scrap recycling program.
The school strives to make environmental responsibility something students will remember throughout their lives.