Environmentalism is a broad movement that seeks to protect and preserve the natural environment, including its biodiversity, ecosystems, and resources.

Environmentalism promotes the use of renewable energy sources, energy efficiency and conservation, and the development of new energy technologies, all of which contribute to reducing energy consumption and its environmental impact.

Solar energy is often considered the most environmentally friendly renewable energy source because it does not produce greenhouse gases or other pollutants during electricity generation.

Energy efficiency refers to the reduction of energy consumption without compromising services or comfort, often achieved through the use of more efficient technologies and practices.

Energy conservation reduces energy consumption and its associated greenhouse gas emissions, contributing to improved air quality and climate change mitigation.

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

The abundance of fossil fuel resources is not a challenge associated with the transition to renewable energy sources, but rather a factor that has historically hindered the adoption of renewable energy.

Carbon neutrality refers to the process of reducing greenhouse gas emissions to net zero, typically achieved through a combination of emissions reductions and carbon removal strategies.

Oxygen (O2) is not a greenhouse gas, as it does not absorb and trap heat in the atmosphere like greenhouse gases do.

Global warming refers to the phenomenon where the Earth's average temperature increases due to the accumulation of greenhouse gases in the atmosphere, leading to changes in climate patterns and ecosystems.

Improved air quality is not a consequence of global warming, as it is typically associated with the reduction of air pollution rather than the increase in greenhouse gas concentrations.

Carbon footprint refers to the amount of greenhouse gases produced to directly and indirectly support human activities, usually expressed in equivalent tons of carbon dioxide (CO2e).

Flying more frequently increases an individual's carbon footprint due to the high emissions associated with air travel.

Carbon capture and storage (CCS) refers to the process of removing carbon dioxide from the atmosphere and storing it underground or in geological formations.

Improved air quality is not a potential environmental impact of carbon capture and storage (CCS), as CCS aims to reduce greenhouse gas emissions rather than improve air quality.