Together, we then gathered traffic and social metrics for each site, as well as your votes to determine the rankings (see the full methodology here). (entrepreneur.com)
And they're preventing millions of metric tons of greenhouse gas emissions from entering the atmosphere while they're at it. (energystar.gov)
Every year, the billions of metric tons of carbon dioxide (CO2) we release into the atmosphere add to the growing threat of climate change. (sciencemag.org)