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Where climate change leads


To make projections, forecasts are used in complex models. The model can be used to predict what will happen if it increases, for example, content CO2 from the atmosphere.

Fabila To assess a model, past data are entered and checked for predicted with sufficient accuracy lasituación current and therefore known. If so, the model is considered validated.

what climate models predict?

• The global average temperature of Earth will have increased at the end of the century between 1.4 and 6 º C.
• sea level at the end of the century will be between 20 and 80 cm above the current. Many coastal areas will be flooded.
• Severe weather accentuate extremes. Become more frequent and intense hurricanes, droughts, floods and heat waves.
• environment: loss of biodiversity, altering seasonal rhythms of species, loss of wetlands and other ecosystems are particularly vulnerable.
• health effects, particularly in non-developer. Tropical diseases like malaria could spread to areas that now have temperate climates.

A disparate impact

• Not all places are equally vulnerable to a given change . For example, rising sea level will affect most coastal areas, its cities and its ecosystems.
• everywhere No changes will be of the same magnitude. While it is expected an increase of precipitation on a global scale, its distribution is very uneven, so that in some places, such as the Mediterranean, rainfall will decrease.

effects of global warming

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Increased greenhouse gases

As of 1750, with the start of the industrial revolution the concentration of these gases has been increasing and now this incrtemento mind deepens dramatically.

activities that generate the greatest increase in greenhouse gases:

• combusribles burning fossil fuels. emissions of greenhouse gases more important due to burning oil, gas and coal.

• deforestation. vegetation due to the dotosíntesis, removed from the atmosphere imprtantes amounts of CO2. Accordingly, any activity involving a reduction in forest area tnedrá result in an increase of CO2 in the atmosphere.

• Certain farming activities. Domestic cattle, beef, veal or pork emitted into the atmosphere great cantdad of methane generated in the intestinal fermentation. Also, certain crops such as rice, emit this gas is, after the CO2, which is influencing more global warming.

1. An unequal distribution.

Everyone emit CO2 into the atmosphere, and we do not only breathing but also when we turn on the heater, connect the TV or pick up the car.

What is Climate Change?

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Why climate change?

1. External causes or astronomical.
are reasons beyond the internal climate system of Earth.

• solar activity changes . Affect the very source of energy and its consequences reach Earth.

• Changes in Earth orbit. Obiter described by Earth gradually changes from an almost circular to a more elliptical. This process takes about 100,000 years and adjust the radiation that reaches Earth.

• meteorite impact. A meteorite is sprayed to collide with Earth and creates a dust cloud that lingers long in suspension.

2. internal causes.
Determine what to do with that radiation.

• Changes in albedo. The average value of the Earth is 30% but varies greatly from one area to another. Consequently, changing the surface coverage is amended global temperature.

• Changes in atmospheric composition. The atmospheric composition can be changed by the intervention of agencies, which will increase or decrease the amount of CO2 and O2, or a major volcanic activity can introduce much CO2 in the air, but also as a result of burning fuels and other human activities increasing CO2 and O2 decrease.

• Changes in ocean currents. In areas close to Ecuador more solar radiation reaches the latitudes near the poles, leading to large temperature differences. Ocean currents, winds also, help reduce these differences.

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past climates

Throughout the history of the Earth's climate has changed many times and made it even globally affecting the entire planet.

20000 years ago ice covered northern Europe, Scandinavia, reaching 2500 meters thick. This was the latest Quaternary glacial advance, a period covering the last 2 Ma But there have been very warm periods, with average temperatures exceeded 22 º C.

CHANGES IN SEA LEVEL

-Changes in water cycle . In summary, the water cycle involves evaporation of the oceans, forming clouds which precipitates and back to sea, or gone directly travésde rivers. During the glacial periods is frequent rainfall and snow and ice transfomer remains on the continents. The withdrawal of seawater and their accumulation on the continents as ice represents a decrease of sea level.

"Thermal expansion of water. In the warm periods sea level rises, not only because acumuldo ice melts and more water in the oceans, but because to find ocean water expands at higher temperatures.