GLOBAL WARMING

Global Warming

Global Warming

Introduction

There is scientific consensus that the current global warming is very likely due to human activities. Climatic changes of the system as a result of natural internal processes or in response to external stimuli non-anthropogenic and anthropogenic). At the same geological and paleontological data indicate the presence of long-term climate cycles, which in the Quaternary period took the form of periodic glaciations, and currently accounts for interglacial. The causes of climate change remain unclear, but among the major external factors - changes in the Earth's orbit, solar (including changes in solar constant), volcanic emissions and the greenhouse effect. According to direct observations of climate (temperature measured during the last 200 years), average temperatures on Earth have risen, but the reasons for this increase remains a subject of debate. One of the most widely discussed reason is the anthropogenic greenhouse effect (Bily, 2006). Not that there is a dispute between those who believe and does not believe in the theory of greenhouse effect. Rather, it challenged the final effect of increasing amounts of greenhouse gases in the atmosphere, that is not offset by a warming effect of greenhouse effect changes in the distribution of water vapor, clouds, changes in the biosphere, or other climatic factors.

Discussion

The observed increase in the last 50 years, Earth's temperature is contrary theories about the role of compensating the above feedback. Global warming is a term used to refer to the phenomenon of increased temperature global average, the Earth's atmosphere and oceans, possibly reaching the level of heating of the Middle Ages to the mid- twentieth century, to exceed it from then (Gore, 2006).

All data collections representative from the ice cores, the growth rings of trees, etc., indicate that temperatures were warmer during medieval times, cooled to low values during the XVII, XVIII and XIX and then heated again quickly. When studying the Holocene (last 11.600 years), the Intergovernmental Panel on Climate Change (IPCC) shows no evidence that there were global annual average temperatures warmer than today (Haugen, Musser & Lovelace, 2010). If projections of a warming of about 5 ° C this century materialize, then the planet will have experienced a number of global mean warming like the one suffered at the end of the Ice Age wisconsiense (last ice age), according to the IPCC there is no evidence possible that future global exchange rate has been matched in the last 50 million years for a comparable temperature rise.

The phrase global warming refers to a phenomenon in which the Earth's surface temperature increases from its long-term averages because of an atmospheric blanket of greenhouse gases (GHGs; primarily carbon dioxide, methane, and chlorofluorocarbons) that serve to trap reradiated solar energy from escaping into space (Muller, 2008). This blanket of greenhouse gases is responsible for providing Earth a temperate, stable, and life-sustaining climate. In common parlance, global warming regularly uses interchangeably with climate change. In the present context, it used in a more restricted sense as a driver of global climate ...