The importance of water and air in our daily life is clear to everyone, though they represent fragile Earth resources that can change abruptly at times. Understanding the mechanics of climate change provides us with an essential need to prepare for the future. Saudi Arabia has huge ancient groundwater reserves that are continuously under increasing demand. The total number of wells in Saudi Arabia increased by more than 100% from 1982 to 1990, and the total irrigation demand in 1997 was 22,933.4 million cubic meters (Rasheeduddin et al., 2001). This type of research has been applied over Saudi Arabia for the first time and will open many opportunities to investigate the effects of climate change on various sectors and resources in Saudi Arabia. In this study we will shed light on what is expected to face us with regard to precipitation, wind speeds, runoff, temperature, and evaporation. This information can point the sensitive areas that might be affected by climate change and help in designing a proper plan to manage our water resources. This research will provide future climate variables for scenario A2 which calls for high emission of carbon dioxide and explosion of the world population (Treut et al., 2007). Those climate variables can be used by hydrologists to predict the effects of climate change on the recharge of aquifers and consequently the future status of aquifers in terms of storage and yields by implementing available hydro-logic models.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.