Remember solar energy has been used by our ancestors in many ways. The glass lenses were used for creating fire by magnifying the sun rays. Even prior to that, the flint stones were used to create fire. Now the solar energy can be harnessed for creating electricity which could be stored and distributed in a pollution free atmosphere. Large investment is one of the primary reasons why solar energy is still not used by many people across the world.

Natural resources are resources that occur in nature without any manmade assistance. Any naturally occurring substance qualifies as a natural resource, including animals, plants, water, oil, coal, minerals, timber, land, light, soil, and energy. Natural resources can be renewable or nonrenewable: Renewable resources refer to undiminishable substances, such as solar and wind energy, biomass energy, and hydropower. Nonrenewable resources refer to resources that cannot be naturally replenished at an adequate pace to meet growing demands. Nonrenewable resources include water, fossil fuels, natural gases, minerals, and nuclear energy.

Greenhouse gas emissions from human activities strengthen the greenhouse effect, contributing to climate change. Most is carbon dioxide from burning fossil fuels: coal, oil, and natural gas. The largest emitters include coal in China and large oil and gas companies. Human-caused emissions have increased atmospheric carbon dioxide by about 50% over pre-industrial levels. The growing levels of emissions have varied, but have been consistent among all greenhouse gases (GHGs). Emissions in the 2010s averaged 56 billion tons a year, higher than any decade before.[4] Each year, about 6.7 million people die from polluted air quality.