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human activity&energyflow
2
HUMAN ACTIVITY
on
ENERGY FLOW
Elizabeth Peters, Micaella Monge, Flavia Valencia, Mikel Gonzalez and Rafaella Ramirez
Introduction
Photosynthesis
Oil and coal
INTRO
Years ago, sunlight was one the only energy source humans could have. However, as then the variety of energy sources increased; between them, the combustion of fossil fuels.
Throughout human history different natural man needs interfered with the earth natural environment, affecting and changing the Flow of Energy and Matter Cycle.
Energy flows
Population growth through increased food output rapidly increased. The combustion of fossil fuels has altered the way in which energy interacts with the atmosphere
Consequences
- Habitat destruction
- Climate change
- Acid deposition
- Reduction of non-renewable resources
ENERGY FLOWS
MATTER CYCLES
Matter cycles
Matter cycling is very important in ecosystems
In the rain forest, for example, the soil has a very low fertility rate, so the decomposition of leaves, plants, animals and big trees helps give nutrients to the soil
If a large expanse of forest is burned down or destroyed, the natural nutrients are also lost
E X A M P L E S
There are many human activities that contribute to the contamination of different ecosystems altering the energy flows and matter cycles. This has a relevant and significant impact.
some of this activities include:
EXAMPLES
FOSSIL FUELS
The combustion of fossil fuels alters he interaction of the energy from the sun with the atmosphere and the surface on our planet. As this human activity increases the levels of CO2, a GHG, it alters the carbon cycle and contributes to the increase in temperature.
FOSSIL
fuels
The arctic
This affects the energy flow from the sun to different ecosystems. The increased interception of radiation from the sun due to pollution has, as well cause a reduction of arctic land and sea ice over the years.
Timber harvesting
Especially in rainforest, timber harvesting affects the nutrient cycle . In this ecosystem soils have low fertility and nutrients cycle between the tree biomass and leaf litter.
Raid decomposition due to warm conditions and rainfall the soil absorbs nutrients from the tree and leaves. However when trees are cut down the canopy no longer intercepts with rainfall
timber
HARVESTING
In South East Asia large areas have been cleared out for the production of palm oil.