Sun Microsystems has just launched OpenEco 2.0, the second version of its online community created to help companies calculate and compare their greenhouse gas emissions.

The newest manifestation of the site allows participants to examine their carbon footprint from sources like business travel, steam, mobile, electricity, and gas use. Users can also report GHG data with industry-standard metrics.

Other features of the site include tracking of emissions trends over time, open APIs for mashups or extensions, and easy data import and export.

Hopefully, Sun's updates will encourage even more organizations to join their site — it is an invaluable resource for participants looking to set benchmarks and best practices for their carbon emissions. The only requirement to gain entry to the site is  disclosure of carbon emissions data either openly or anonymously.