Global warming is also referred as climate change. It is the notice of the rise in the average temperature of the Earth’s climate system. Scientific evidence shows that the climate system is warming. Global warming is the steady and continuous rise in the level of earth temperature. Our Earth surface is becoming hotter day by day just because of some unnoticeable habits humans are making. Global warming has become a threat for the Earth’s atmosphere as it is reducing the life possibilities on the Earth. As sunlight hits the Earth, some of the heat is reflected back into space, while some is absorbed by greenhouse gases. Greenhouse gases are naturally occurring atmospheric gases such as carbon dioxide and methane. Like insulation, the heated gas and atmosphere keep the Earth warm enough to sustain life. More gas means more heat from the sun is trapped on the Earth, raising its temperature. Manthans come from the decomposition of wastes in landfills, and manure management associated with domestic livestock, natural gas and oil systems, and coal mining.There are both natural and human sources of carbon dioxide release. Natural sources include decomposition, ocean release and respiration. Humans have an impact that includes cement production, deforestation and also the burning of fossil fuels like gas,coal and oil.There have been at least five major ice ages in the Earth’s history (the Huronian, Cryogenian, Andean-Saharan, Karoo Ice Age, and the current Quaternary glaciation). The Earth seems to have been ice free even in high latitudes. The most recent ice age began about 1.8 million years ago during the Pleistocene Era. During this time, giant ice sheets advanced and fell back many times in North America and Europe. The Medieval Warming Period was a time when the North Atlantic and other regions were pretty warm. The Medieval Warm Period was caused by an increase in solar radiation and a decrease in volcanic activity. They both promote warming. Other evidence says that ocean circulation patterns shifted to bring warmer sea water into the North Atlantic. The Little Ice Age was a period of cooling that occurred after the Medieval Warm Period. It was not an actual ice age. The Little Ice Age was caused due to the cooling effect of the large volcanic eruptions. It also changed in the Arctic ice over.Over the course of history, global temperature, carbon dioxide, and methane levels have changed. According to temperature analysis conducted by scientists at NASA’s Goddard Institute for Space Studies (GISS), the average global temperature on Earth has increased by about 0.8° Celsius (1.4° Fahrenheit) since 1880. Two-thirds of the warming has occurred since 1975, at a rate of roughly 0.15-0.20°C per decade. Carbon dioxide has also tremendously increased, causing more global warming. Currently, humans are releasing around 29 billion tons of carbon dioxide into the atmosphere per year. Around 43% remains in the atmosphere.While there are questions over how much the airborne fraction is increasing, it is clear that the total amount of CO2 in the atmosphere is increasing dramatically. Current CO2 levels are the highest in 15 million years. Methane levels are also increasing. Here I have evidence, “Methane in the atmosphere was almost flat from about 2000 through 2006. Beginning 2007, it started upward, but in the last two years, it spiked,” said Rob Jackson, an earth scientist at Stanford University who co-wrote the study.Many consequences are occurring right now as a result of global warming. One can be Coral reef bleaching. Coral reef bleaching is when water is too warm and corals will expel the algae, living in their tissues causing the coral to turn completely white. In 2005, the U.S. lost half of its coral reefs in the Caribbean in one year due to a massive bleaching event. Climate change is the greatest global threat to coral reef ecosystems. As temperatures rise, mass coral bleaching events and disease outbreaks are becoming more frequent. Another can be increased droughts. Droughts can have many different causes that depend on the area of the world. Scientists have started to find much more intense droughts to the climate change in different areas. That’s because as more greenhouse gas emissions are released into the air, it causes air temperatures to increase. Once this happens, more moisture evaporates from land and lakes, rivers, and other bodies of water. Warmer temperatures also increase evaporation in plant soils, which affects plant life and can reduce rainfall even more. And when rainfall does come to drought areas. The drier soils it hits are less able to absorb the water. Longer and stronger hurricanes are also a result of global warming. While hurricanes are a natural part of our climate system, recent research suggests that there has been an increase in intense hurricane activity in the North Atlantic since the 1970s. In the future, there may not necessarily be more hurricanes, but there will likely be more intense hurricanes that carry higher wind speeds and more precipitation as a result of global warming. The impacts of this trend are likely to be increased by sea level rise and a growing population along coastlines. Sea levels are also rising as the oceans warm and sea water expands. This expansion combined with the melting of land based ice, has caused global average sea level to rise by about 7-8 inches. Ocean temperatures have also increased as a result of global warming. The rate at which the oceans are heating up has nearly doubled since 1992, and that heat is reaching ever deeper waters, according to a recent study. Ocean acidification is the decrease of pH levels in Earth’s Oceans, caused by the increase of carbon dioxide in the atmosphere. Oceans have become more acidic. As humans burn more and more fossil fuels, the concentration of carbon dioxide in our atmosphere continues to rise, driving climate change and making both air and sea temperatures hotter and hotter. These are some of the consequences that are occurring as a result of global warming. Humans have many effects on the atmosphere. Some can be water pollution, air pollution and climate change. Humans pollute water by putting wastes into it. Also, too many nutrients can reduce water quality by causing overgrowth of certain bacteria and algae that use the oxygen for other species to survive. Therefore, nutrients can reduce water quality in places far removed from where they were first settled. The majority of air pollution is the result of human activities. Increased fossil fuel combustion from motor vehicles, industrial factories and power plants make lots of air pollution such as carbon. Due to all these greenhouse gases, humans daily actions are making the Earth warmer each second. Over a longer period of time, our climate will be majorly different, if we don’t try to prevent global warming. The global temperature is also rising due to many reasons. According to NASA, “As the Earth moved out of ice ages over the past million years, the global temperature rose a total of 4 to 7 degrees Celsius over about 5,000 years. In the past century alone, the temperature has climbed 0.7 degrees Celsius, roughly ten times faster than the average rate of ice-age-recovery warming.” It is due to both, human influences and a normal cycle. The Earth has experienced a lot of forms of climate change in the past ,without any help from humans as well. We know about past climates because of evidence left in tree rings, layers of ice in glaciers, ocean sediments, coral reefs, and layers of sedimentary rocks. For example, The bubbles of air in the glacial ice trap have many tiny samples of Earth’s atmosphere. These give scientists a history of greenhouse gases. The chemical makeup of the ice provides clues to the average global temperature. This shows that natural causes can affect the heating of the Earth and that not only humans have caused global warming. Humans still have effects on global warming, said early in the essay. Other factors can account for some of the climate and temperature variations we’ve seen. One could be increased solar activity. Changes in the shape of Earth’s orbit as well as the tilt and position of Earth’s axis can also affect the amount of sunlight reaching Earth’s surface. Natural changes in reflectively, like the melting of sea ice, have contributed to climate change in the past. Volcanoes have played a noticeable role in climate. The volcanic particles that can reach the higher atmospheres can reflect enough sunlight or solar energy back to space so it can cool the surface of our planet. These are some other factors that change the climate of the Earth. I do agree with the scientist in saying that global warming is a moral issue. If the Earth heats up too much in another decade, lots of issues will come towards humans and animals ways. Humans do have a huge impact on it, and we can make alternative strategies to help stop global warming. One way can be to power your home with renewable energy. You can reduce water waste; eat all the food you buy, with using less meat, without throwing any out; Buy better light bulbs; take out plugs that are in outlets when not using; drive a fuel-efficient car. There are many ways humans can help to prevent global warming, I hope you can find a better lifestyle in saving the Earth from any more damage!