Natural Gas is a fossil fuel, which is a non-renewable energy source.

As of 2021, China has the highest installed capacity of solar PV systems, followed by the United States, Germany, and India.

Carbon Dioxide (CO2) is the primary greenhouse gas emitted by the burning of fossil fuels, contributing significantly to climate change.

Weatherization involves improving the insulation of a building to reduce heat loss or gain, thereby increasing energy efficiency.

Energy Mix refers to the combination of different energy sources used to generate electricity, aiming to balance reliability, cost, and environmental impact.

Solar energy has the lowest carbon footprint among the given options, as it does not produce greenhouse gases during electricity generation.

The primary objective of the Paris Agreement is to reduce greenhouse gas emissions and limit global warming to well below 2 degrees Celsius, preferably to 1.5 degrees Celsius, compared to pre-industrial levels.

Energy efficiency measures aim to reduce energy consumption and associated greenhouse gas emissions, so increased greenhouse gas emissions is not a benefit of energy efficiency.

Carbon Capture and Storage (CCS) involves capturing carbon dioxide (CO2) from industrial processes or power plants and storing it underground or in geological formations to prevent its release into the atmosphere.

Encouraging the use of fossil fuels is not a sustainable energy practice, as it contributes to greenhouse gas emissions and environmental degradation.

Energy Sustainability refers to the ability of an energy system to meet current and future energy needs without compromising environmental, economic, and social sustainability.

Increased energy demand is not a challenge associated with the integration of renewable energy sources into the electricity grid, as renewable energy sources can contribute to meeting the growing energy demand.

The primary objective of energy policy is to ensure affordable and reliable energy supply, promote energy efficiency and conservation, and reduce greenhouse gas emissions and mitigate climate change.

Carbon RECs are not a type of renewable energy certificate, as they represent carbon offsets rather than renewable energy generation.

Waste-to-Energy refers to the process of converting waste materials into usable energy, such as electricity or heat, through incineration, gasification, or anaerobic digestion.