The United States has taken more proactive steps to increase eco-friendly projects. One of the biggest projects revolves around building and retrofitting commercial spaces.

When the U.S. Green Building Council (USGBC) released its fourth edition of LEED certification standards, it was intended to challenge builders — now it is in the midst of processing more than 4,600 LEED projects around the world, according to its press release.

To show how far this nation has come toward increasing commercial green recycling efforts, the USGBC released the list of the top 10 states that had made an impact through LEED building projects. Collectively, the states have transformed about 226 million square feet to be more efficient yet environmentally sustainable.

“The list of the Top 10 States for LEED is a continuing indicator of the widespread recognition of our national imperative to create healthier, high-performing buildings that are better for the environment as well as the people who use them every day,” USGBC founding chair Rick Fedrizzi said in the statement.

This year’s round of judging went with a different methodology, one that changed rankings for top contributors like California, Clean Technica reported. Because the USGBC compared certified projects to the number of square feet space per resident, it moved fifth place Illinois up to the number one spot. Washington D.C.’s reclassification as a federal district, not a state, also takes them out of the rankings altogether, even though projects in this area were 32.45 square feet per-capita.

“This twist is due to USGBC calculating the list using per-capita figures to create a fair comparison of green building activity taking place among states with significant differences in population and overall buildings,” Clean Technia contributor Silvio Marcacci wrote.

Nonetheless, fifth-ranked California had 595 LEED certified projects, trumping over Illinois’ 171 buildings and Washington D.C.’s 106 total. Being a highly populated state, California’s contribution changed 1.95 square feet per-capita — holding a tie with New York in 2013.

“I congratulate everyone in these states whose contributions to resources saved, toxins eliminated, greenhouse gases avoided and human health enhanced help guarantee a prosperous future for our planet and the people who call it home,” Fedrizzi added.

This latest report continues to demonstrates the Golden State’s commitment to improving the environment. Whether it be through larger initiatives like renovating these buildings or a smaller, but impactful contributions like utilizing remanufactured business furniture, Californians should be proud of these accomplishments.