I. As a result of sea-level rise, storm surge, and flooding from extreme precipitation events, or in anticipation of such events as projected by the Coastal Risk and Hazards Commission final report, “Preparing New Hampshire for Projected Storm Surge, Sea-Level Rise, and Extreme Precipitation,” and subsequent science and technical advisory panel reports under N.H. Rev. Stat. § 483-B:22, the legislative body of a municipality may declare a climate emergency and engage in planning for municipal cooperation and for municipal boundary adjustment or unification with one or more other municipalities. Municipal boundary adjustment or unification may include (a) the alteration of existing municipal boundaries or (b) the creation of a new municipality incorporating the existing boundaries of such municipalities and the creation of new, unified legislative and governing bodies. During this process a municipality may discontinue public roads pursuant to N.H. Rev. Stat. § 231:43 or N.H. Rev. Stat. § 231:45.
II. A proposal for municipal boundary adjustment or unification shall be presented in a bill to the general court after approval by a majority vote of each of the governing bodies of the municipalities affected. Approval of the boundary adjustment or unification by the general court and the respective municipalities shall follow the process for alteration of town lines under N.H. Rev. Stat. § 51:9. A legislative enactment authorizing the unification of 2 or more municipalities shall establish the form of government for the resulting municipality and a process for electing or appointing all necessary municipal officers if the unification is approved as provided in N.H. Rev. Stat. § 51:9.