Global warming can be defined as the increase in sea level on Earth due to an increase in surface temperature. Over the past few decades, there have been debates about the possible causes of global warming. Greenhouse gases and ozone depletion are one of the most important factors geologists face in the fight against global warming. This poses a major problem not only for geologists, but also for policy makers, foresters, scientists and, of course, the inhabitants of Earth. Greenhouse effects are natural processes in which the earth's temperature remains habitable. There are also many medical problems and health risks that can harm humans, due to global warming and climate change. Ozone is also a major defense system for humans, as it defends us against the sun's harmful rays coming in our direction. Greenhouse gases such as carbon dioxide, methane and water vapor help maintain the temperature of the sun's rays indoors and keep the Earth warm. There is an ongoing debate among scientists about whether or not greenhouse gases are the effect of global warming. Some believe this is due to natural phenomena such as volcanoes and wildfires, while many blame humans as the sole culprit for global warming; due to our fossil fuel emissions. Coal, oil, and methane are all examples of widely used fossil fuels that release greenhouse gases into the atmosphere (Clemmit 2006). The problem we face today is that the ozone layer has become depleted, while greenhouse gases have become too effective (Bushnell 2010). This can be seen by the immense pollution in major metropolitan cities such as Tokyo, Japan, and Los Angeles, California. We take our middle of paper......their biodiversity and their food sources, will also see a major impact on their ecosystem (Haines 2005). Particularly in regions that are poorer and considered third world countries, the way they rely on human health may be completely changed due to the long-term effects of climate change. In these regions, famine and infectious diseases are common, and many infectious disease agents are sensitive to weather conditions. This means that because these pathogens live outside the body, they can easily transmit across populations (Haines 2005). In order to prevent global warming and climate change, we will need to implement a series of changes. in order to maintain a lifestyle similar to the one we have managed to adapt to, but we will also need to think about ways to either use renewable energy sources or reduce our fossil fuel emissions..