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Copy of Prezi 3D TEMPLATE by sydo.fr

Awesome template but don't use it with Chrome... Or it may crash ! (sorry)

Pranav Bawse

on 9 December 2016

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Transcript of Copy of Prezi 3D TEMPLATE by sydo.fr

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Wet Lands
What are wetland’s?
Wetlands are basically the areas where water covers the soil, or it is present either at or near the surface of the soil all year. ( swamps or marshes )
What role do the wetland’s play?
Wetlands are like sponges they prevent flooding by holding water, by doing so, wetlands help keep river levels normal and purify the surface water.
How does pollution and human activities impact the water cycle?
As the human population has increased, so have our demand for food and to make more food, We need more water.
Human activities that affect the water cycle are generating hydroelectricity, irrigation, deforestation and the greenhouse effect, as well as motor vehicle use and animal farming.
Hydroelectricity is an example that involves changing the stored gravitational energy of water held behind the dam into electrical energy that can be used. It does have enviornmental affects even though it has no pollution.
How does pollution and human activities impact the water cycle?
Irrigation is a another human activity the artificial watering of land that does not get enough water through rainfall. Irrigation is used substantially by most countries, some more than others. Dry lands require far more water, as do countries that have large intensive farming communities.
The removal of trees is having a major impact on the water cycle, as local and global climates change.
Humans and wetlands
In the past centuries wetlands were considered to be nature's failiure, a waste piece of land. land unable to produce crops or timber was considered worthless. Many people began to think of draining these lands for commercial development.
In the past 100 years up to 70% of the wetlands in the lower fraser valley have been lost due to human activity.
Humans and wetlands
Louisiana's wetlands continue to disappear at an alarming rate of 24 square miles a year, because of the human-made structures that disrupt the natural water flow and threaten these important ecosystems.
What significant ecological role do the wetlands play as it relates to hurricanes?
Unfortunately people have altered the hydrology of Louisiana's, which Increases the risk of a flood into the coastal communities and habitats in case of a hurricane such as Katrina, But much of Louisiana's coastal marshes are actually eroding. Louisiana is the opposite of healthy coastal wetlands.

NYC’s Defense
In the New York City region, more than 80 percent of the coastal wetlands that once formed a ring of green around Jamaica Bay and our tidal streams are filled and developed.
The destruction from Sandy would have been significantly less if they were still present.
people in New york can successfully restore and reconstruct salt marshes, They have already started.
How much protection wetlands can provide altogether to an urban area will depend on how much wetland they can restore or reconstruct.
These restored and reconstructed marshes have proven to be resilient to storms.
San Francisco's Defense
It is estimated that in the last 150 years, approximately 90% of San Francisco Bay’s tidal wetlands have been lost or seriously degraded.
We did it by filling the wetlands and the Bay itself for military, industrial and residential uses.
Since the 1970s, more than 50 tidal restoration projects have been implemented around the Bay.
The Bay is still at threat from people that stand to profit from filling the Bay or developing its shorelines regardless the rapid sea level rise from climate change.
The Pacific flyway
It is the flyway for major north to south flyway for migratory birds in America, extending from Alaska to Patagonia.
A halophytes is a plant that grows in waters of high salinity
The mixture of river water and sea water in the estuaries.
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