WESTBROOK — Maine environmental advocates will gather in Westbrook in support of the multi-state Regional Greenhouse Gas Initiative.

The Natural Resources Council of Maine and others say the agreement is slated to hold its 25th auction of carbon credits. The council and others will gather at a Hannaford grocery store in Westbrook on Wednesday at 10 a.m. to celebrate the milestone.

The Regional Greenhouse Gas Initiative is a so-called “cap-and-trade” program that seeks to reduce carbon dioxide pollution by placing limits on emissions by fossil fuel-burning power plants. Its auctions allow power generators to acquire credits needed to comply with the program.

Colby College professor and environmental economics expert Tom Tietenberg will be among the people attending.

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