這項「綠色黨代表計畫」（Green Delegate Challenge）是民主黨整年計畫當中的一環，同時也劃下黨史上最具永續環保概念的一次會議。
As delegates from across the country converge on Denver for the Democratic National Convention opening Monday, most of them are buying offsets to neutralize the carbon dioxide emitted to power their planes, trains and cars.
This Green Delegate Challenge is part of the Democrats' year-long effort to make their 2008 national convention the most environmentally sustainable convention in the party's history.
"We're committed to using practical, common-sense solutions to limit our impact on the environment and make this convention one of the most sustainably produced events of its kind," said Leah Daughtry, chief executive of the Democratic National Convention Committee.
To offset the climate-warming effect of that ton of carbon dioxide, delegates are purchasing renewable energy from a portfolio of U.S. projects selected by convention organizers and provided by NativeEnergy. They include wind power for a Colorado school district and a landfill gas-to-energy project in Illinois.
The cost of a carbon offset is modest, just $24 for one person flying 2,500 miles to the convention and back home and staying for five nights in a Denver hotel.
Delegations with the highest percentage of members offsetting their carbon emissions will be recognized in their seating section on the convention floor. All the state delegations are participating and about half of them have chalked up 100 percent participation.
When delegates and media arrive at the convention, they will find compact fluorescent, LED and solar powered lighting, and generators fueled by biodiesel. A percentage of the power supplied to convention venues will be generated by wind farms and purchased by the venues through Green-e certified renewable energy credits.
There are many alternatives to gasoline and petroleum diesel for transportation around Denver.
The Pepsi Center, the Convention Center, the DNCC Headquarters Hotel and the DNCC offices are all located within walking distance of either light rail or the 16th Street mall shuttle, which is run on hybrid buses. Most delegation hotels are also accessible from these public transportation systems.
Inside the convention center, the DNCC says on its website that "choosing sustainable materials is at the heart of our greening plan." Sustainable and recyclable service ware, sustainably harvested wood products, and rented or reused materials are being used to stage the event. Materials used will be measured, tracked and wherever possible, reused or donated to community organizations and schools at the conclusion of the convention, organizers say.