rainforest in the Amazon region. Since C-, N- and S-compounds from biogenic and anthrogenic sources have different isotope composition, the pathways of pollutant emission can also be traced. The large global-cycles of a range of elements in the gaseous atmosphere, as well as regional environmental effects, can be diagnosed in this way.
Finally, interest has also been focussed on the element strontium, which is not subject to metabolism, in terms of mineral nutrition. The 87Sr/86Sr ratios in the bed-rock develop in geological times. The different geochemical mobilization of the isotopes allows distinctions between nutrient supply of vegetation from the soil, water or dust in the atmosphere. This facilitates understanding of nutrient sources in ecosystems (Graustein 1989).
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.