A Moscow schoolgirl calculated the cost savings of replacing incandescent lamps with energy-saving and LED lamps for lighting the garden association "Mayak-1" of the Pushkinsky district of the Moscow region. Statistical data for the years 2005–2019 were used in the research. The work was carried out in close cooperation with the administration of the dacha village. Calculations showed a 4.2-fold reduction in electricity costs in the dacha village, which reduces greenhouse gas emissions into the atmosphere by 2531.6 m3. In the spring of 2021, the research materials were transferred to the board of the "Mayak-1" of the Moscow region.
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