Geothermal energy has the least environmental impact because it does not produce greenhouse gases or air pollution, and it does not require the use of land or water.

The primary environmental impact of solar energy is land use, as large amounts of land are required to install solar panels.

Solar energy has the greatest potential to reduce greenhouse gas emissions because it can be used to generate electricity without emitting any greenhouse gases.

The primary environmental impact of wind energy is noise pollution, as wind turbines can generate noise that can be disturbing to nearby residents.

Hydropower is the most reliable renewable energy source because it is not affected by weather conditions and can generate electricity 24 hours a day.

The primary environmental impact of hydropower is land use, as dams and reservoirs can flood large areas of land.

Solar energy is the most cost-effective renewable energy source, as the cost of solar panels has decreased significantly in recent years.

The primary environmental impact of geothermal energy is water pollution, as geothermal power plants can release harmful chemicals into the environment.

Geothermal energy is the most sustainable renewable energy source because it does not produce greenhouse gases or air pollution, and it does not require the use of land or water.

The primary environmental impact of biomass energy is greenhouse gas emissions, as biomass power plants emit carbon dioxide and other greenhouse gases into the atmosphere.

Hydropower is the most widely used renewable energy source, as it is used in many countries around the world to generate electricity.

The primary environmental impact of tidal energy is land use, as tidal power plants require large amounts of land to be built.

Hydropower is the most predictable renewable energy source because it is not affected by weather conditions and can generate electricity 24 hours a day.

The primary environmental impact of wave energy is noise pollution, as wave power plants can generate noise that can be disturbing to marine life.

Solar energy is the most promising renewable energy source for the future, as it has the greatest potential to reduce greenhouse gas emissions and is becoming increasingly cost-effective.