Guia Ciencias Ii

Lack of Natural resources
About how much water is consumed each day by 500-mgawatt coal power plant?
How much water is consumed to produce and refine each gallon (3.79 liter) of gasoline (petrol)
Will you help bring clean water to people who desperately need it?

* Water consumed, or lost to evaporation, would be about 3 million gallons ( 11.3 million liters. Water with drawn from rivers,lakes and other sources would be substantially more 300 million gallons per day in plants with so called “once-througt” coolins systems
* Some 2.8 to 6.6 gallons ( 1o.6 to 25) liter are needed to produced each gallon of crude oil from conventional well in Saudi Arabia or the Inited States and refine it into motor fuel.
The importance of natural resources such as metal ores, oil and freshwater is set to grow further, and this could even lead to international conflict. Which is why environmental and economic policies should be closely interwoven.

Water is an essential resource for life and good health. A lack of water to meet daily needs is a reality today for one in three people around the world.

Globally, the problem is getting worse as cities and populations grow, and theneeds for water increase in agriculture, industry and households.

This fact file highlights the health consequences of water scarcity, its impact on daily life and how it could impede international development. It urges everyone to be part of efforts to conserve and protect the resource.
Poor water quality can increase the risk of such diarrhoeal diseases as cholera, typhoid fever and dysentery,and other water-borne infections. Water scarcity can lead to diseases such as trachoma (an eye infection that can lead to blindness), plague and typhus.
A lack of water has driven up the use of wastewater for agricultural production in poor urban and rural communities. More than 10% of people worldwide consume foods irrigated by wastewater that can contain chemicals or disease-causing organisms.Water is an essential resource to sustain life. As governments and community organizations make it a priority to deliver adequate supplies of quality water to people, individuals can help by learning how to conserve and protect the resource in their daily lives.
The current cycle of global warming is changing the rhythms of climate that all living things have come to rely upon. What will we doto slow this warming? How will we cope with the changes we've already set into motion? While we struggle to figure it all out, the face of the Earth as we know it—coasts, forests, farms, and snowcapped mountains—hangs in the balance.
The planet is warming, from North Pole to South Pole, and everywhere in between. Globally, the mercury is already up more than 1 degree Fahrenheit (0.8 degreeCelsius), and even more in sensitive polar regions. And the effects of rising temperatures aren’t waiting for some far-flung future. They’re happening right now. Signs are appearing all over, and some of them are surprising. The heat is not only melting glaciers and sea ice, it’s also shifting precipitation patterns and setting animals on the move
Sea levels are expected to rise between 7 and 23 inches(18 and 59 centimeters) by the end of the century, and continued melting at the poles could add between 4 and 8 inches (10 to 20 centimeters).
Hurricanes and other storms are likely to become stronger.
Species that depend on one another may become out of sync. For example, plants could bloom earlier than their pollinating insects become active.
Floods and droughts will become more common.Rainfall in Ethiopia, where droughts are already common, could decline by 10 percent over the next 50 years.
Less fresh water will be available. If the Quelccaya ice cap in Peru continues to melt at its current rate, it will be gone by 2100, leaving thousands of people who rely on it for drinking water and electricity without a source of either.
Some diseases will spread, such as malaria carried by...