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Poster Anglais 15.12.15
Transcript of Poster Anglais 15.12.15
The Amazon rainforest plays a vital role in the global ecosystem, regulating temperatures, storing vast quantities of carbon dioxide, as well as providing a home to a huge variety of plants and animals
One of the main contributions to the greenhouse effect is deforestation. As foliage is burned they release incredible amounts of carbon dioxide, methane, and nitrous oxide into the atmosphere
Loss of forests contributes between 12 percent and 17 percent of annual global greenhouse gas emissions, and 20% of the world’s oxygen is produced in the Amazon forest
Rhythms of the rainforest
Clearing out trees and brush for logging or other reasons impacts much more than just trees. The biomass in logged forests has a tendency to drop at alarming rates. Tiny patches of forest have been isolated due to the clearing of trees. Fragmentation in the rainforest can be costly, since three quarters of all rainforest tree species are rare. The final outcome of destroying these trees is likely to be a major loss of plant diversity.
Rainforests have their own unique rhythm and that fragmentation completely changes it.
Loss of habitat
One of the most dangerous effects of deforestation is the loss of animal and plant species due to their loss of habitat ; you lose known species, but also unknown species. Trees of the rainforest provide shelter for some species. The removal through deforestation would allow a more drastic temperature variation from day to night, much like a desert, which could prove fatal for current inhabitants. As a consequence, up to 28,000 species are expected to become extinct by the next quarter of the century due to deforestation.
But this loss of habitat has an influence on the native tribes too, who live thanks to the resources of the rainforest.
The trees also help control the level of water in the atmosphere by helping to regulate the water cycle. With fewer trees left, due to deforestation, there is less water in the air that can return to the soil. Consequently, the soil becomes dryer and unable to grow crops, an ironic issue when you consider the fact that 80% of deforestation comes from small-scale agriculture and cattle ranching.
A disturb water cycle
Further effects of deforestation include soil erosion and flooding. Trees also retain water and topsoil, which provide rich nutrients to sustain additional forest life.
Without trees, the soil erodes and washes away, causing farmers to move on and perpetuate the cycle. The barren land which is left behind in the wake of these unsustainable agricultural practices is then more susceptible to flooding, specifically in coastal regions.
Soil erosion and flooding
A square mile of rainforest can contain as many
as 1,500 different species of flowering plants. Unfortunately modern scientists know the chemical composition of less than 5% of flowering plants in the rainforest. Although 75% of the world use plants for their medicinal qualities.
The rainforest is a huge reserve for a lot of animals, trees insects... For instance, tropical rainforests which cover 6-7% of the earth’s surface, contain over half of all the plant and animal species in the world! The rainforest is one of the most important sectors in the world for biodiversity.
A haven for biodiversity
There are many native tribes, who live thanks to the resources of the rainforest.
Habitat for tribes