Climate Change Global Warming “refers to the variation in the Earth’s global climate or in regional climates over time. It describes changes in the variability or average state of the atmosphere over time scales ranging from decades to millions of years. These changes may come from processes internal to the Earth, be driven by external forces activities. In recent usage, especially in the context of environmental policy, the term “climate change” often refers only to the ongoing changes in modern climate, including the rise in average surface temperature known as global warming.”

Energy Conservation “is the practice of decreasing the quantity of energy used while achieving a similar outcome of end use. Individuals and organizations that are direct consumers of energy may want to conserve energy in order to reduce energy costs and promote environmental values. Industrial and commercial users may want to increase efficiency to maximize profit.”

Renewable energy sources/RES “capture their energy from existing flows of energy, from on-going natural processes, such as sunshine, wind, wave power , flowing water (hydropower), biological processes such as anaerobic digestion, and geothermal heat flow. The most common definition is that renewable energy is from an energy resource that is replaced by a natural process at a rate that is equal to or faster than the rate at which that resource is being consumed. Renewable energy is a subset of sustainable energy.”

“Sustainable energy sources are energy sources which are not expected to be depleted in a timeframe relevant to the human race, and which therefore contribute to the sustainability of all species. This concept is termed sustainability. Sustainable energy sources are most often regarded as including all renewable sources, such as solar power, wind power, wave power, geothermal power, tidal power, and others. Fission power and fusion power meet the definition of sustainability, but there is controversy over whether or not they should be regarded as sustainable.”