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How can renewable energy reduce greenhouse gas emissions?

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Grinnell Glacier shrinkage — Global warming A series of photographs of the Grinnell Glacier taken from the summit of Mount Gould in Glacier National Park, Montana, in (from left) 1938, 1981, 1998, and 2006. In 1938 the Grinnell Glacier filled the entire area at the bottom of the image. By 2006 it had largely disappeared from this view.

Renewable energy reduces greenhouse gas emissions primarily by replacing fossil fuels—such as coal, petroleum, and natural gas—as the primary source of energy for electricity generation and transportation.123

The combustion of fossil fuels releases large amounts of carbon dioxide and other greenhouse gases that have been stored underground for millions of years, directly contributing to the greenhouse effect and global warming. In contrast, renewable energy sources—including solar power, wind power, hydroelectric power, geothermal energy, and tidal power—are naturally replenished and produce significantly lower emissions.24

By transitioning to these cleaner technologies, societies can lower their carbon footprint and work toward net-zero emission goals. This shift is a central component of mitigation policies designed to combat climate change, as it fundamentally changes energy use patterns to favor less carbon-intensive generation. Additionally, renewable energy projects can serve as carbon offsets, compensating for emissions by ensuring that energy production occurs without the high greenhouse gas output associated with traditional fossil-fuel combustion.4356