ANSWERS: 1
  • Greenhouse gases (gaseous water and carbon dioxide) don't burn. But of the log fire and the gas heater, the gas heater will release the least carbon dioxide for a given amount of heat. The electric heater is more complicated but most electricity comes from burning fossil fuels, and electric production isn't very efficient, so more fossil fuels are needed than would be needed if you burnt them directly in your home. So the electric heater is worst of all. Yet it has the potential to be the best, if the electric companies can use enough non-carbon-producing forms of energy, such as nuclear and green.

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