Attention has begun to shift from local, short-term seasonal patterns of temperature, rainfall, other elements of the weather, toward longer-term trends that can affect the entire Earth, se long-term (typically 30-year) weather trends are called “climate.” It is therefore important understand the difference, as well as the relation, between “weather” and “climate.” An example of the relationship between weather and climate is El Nino, which is weather with local, short-term consequences as well as with global, long-term importance. Irish sugar skull In the ort-term. El Nino can bring a dry summer for some regions and a wet winter for others; however, over the course of many years, the number of times El Nino conditions occur may decade changes in the global climate. Variations in the behaviour of the weather over long time periods, such as from one century another, are referred to as climate change. Climate itself adjusts from the times of ‘ice ages,’ hen huge ice sheets covered large areas that are currently ice-free, to periods similar to today hen ice sheets are largely confined to Antarctica, Greenland, and the floating Arctic sea ice.

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Paleo-climate records indicate that much of the climate changes over the last two million years occured in a rather cyclical manner; with glacial periods lasting roughly 100,000 years with warmer interglacial periods of 10,000 years occurring in between. The sun, of course, is the ultimate source of heat energy reaching the Earth, fueling our weather systems, and establishing our major climate zones. Irish sugar skull There is, however, good evidence that larger variations in the sun’s activity do occur. For example, during the last half of the 17th century, there was a period of greatly reduced solar activity. This was also a time of harsh winters and extended bitter cold referred to as the Little Ice Age. Scientists do not yet understand the underlying cause of such larger scale variations in solar activity, but do know that they can play a key role in shaping the Earth’s climate. Global climate has been changing and still continue to change. Over a long period of time, climatic fluctuations may be such that, a shift in type of climate prevailing over a given area, takes place. In that case, we talk of a The Potential Relationship Between Human Activity and Climate Change The idea of global warming has been around for over one hundred years, but in recent decades climate change has become a serious threat to national security.

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To better understand, global warming is defined as the gradual increase in the overall temperature of the earth’s atmosphere, generally recognized as the greenhouse effect, and is caused by increased levels of carbon dioxide, CFCs, and other pollutants, also known as greenhouse gases. Irish sugar skull Researchers have debated for years about the main causes of global warming. Although history can show that global warming is inevitable, the majority of evidence points to human industry and agriculture as a primary cause for This replaces the production of oxygen and clean air, with poisonous greenhouse gases.With all the toxic exposure of carbon dioxide polluting the air “multiple lines of scientific evidence show that Earth’s global average surface temperature has risen some 1.3°F since 1850” (Ecological 4). Industries in the world today are well aware of the effect their production companies have on the environment, but as long as profit is involved, there is no stopping them.

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