If a proposed three-year moratorium on wind power in Vermont starts to pick up support in the Legislature, several environmental groups are ready to oppose it. Senators Robert Hartwell, a Bennington County Democrat, and Joe Benning, a Caledonia County Republican, proposed such a moratorium on large-scale wind projects on Vermont’s mountains last week. Among their complaints is that the projects damage the environment. But environmental groups, including the Vermont Natural Resources Council, Conservation Law Foundation, and Vermont Public Interest Research Group, are already on the record opposing a moratorium. Those groups say Vermont needs wind power among its strategies to fight climate change by reducing the state’s greenhouse gas emissions.