Which energy source is not considered sustainable?

Which energy source is not considered sustainable?

• A. Coal
• B. Wind
• C. Solar
• D. Biomass

Answer: (A)

Sustainability of energy sources means choosing options that can meet our needs without exhausting resources or causing unacceptable environmental harm. Coal is not sustainable because it is a finite fossil fuel. Dimming the lights on the long term, burning coal releases large amounts of carbon dioxide and other pollutants, driving climate change and harming air quality and health. Its extraction also disrupts ecosystems and landscapes. Once burned, the energy from coal isn’t replenished on a human timescale, so relying on it cannot be maintained indefinitely. Wind and solar are renewable energy sources that rely on natural, plentiful inputs—wind and sunlight—so they can provide energy for the long term with minimal emissions during operation. Biomass is renewable if the feedstock is managed responsibly, since new plants or residue can replace what’s used, though its sustainability depends on how it’s sourced and how emissions are handled. Because of these characteristics, coal stands out as not sustainable, while the others are considered more sustainable options.

Sustainability of energy sources means choosing options that can meet our needs without exhausting resources or causing unacceptable environmental harm. Coal is not sustainable because it is a finite fossil fuel. Dimming the lights on the long term, burning coal releases large amounts of carbon dioxide and other pollutants, driving climate change and harming air quality and health. Its extraction also disrupts ecosystems and landscapes. Once burned, the energy from coal isn’t replenished on a human timescale, so relying on it cannot be maintained indefinitely.

Wind and solar are renewable energy sources that rely on natural, plentiful inputs—wind and sunlight—so they can provide energy for the long term with minimal emissions during operation. Biomass is renewable if the feedstock is managed responsibly, since new plants or residue can replace what’s used, though its sustainability depends on how it’s sourced and how emissions are handled. Because of these characteristics, coal stands out as not sustainable, while the others are considered more sustainable options.