Generally, the effect of high C02 levels shows a strong initial effect on growth, which diminishes over time. Although there is always at least some decrease in response, the amount of this decline varies a lot. In most natural and semi-natural ecosystems, there is an initial response in growth rate of the plants above ground, followed by a major decline back almost to a "normal" growth rate. In the case of woody plant ecosystems, the enhancement of growth rate generally seems to keep up better in young forest that is growing on relatively fertile soils (such as the example of the North Carolina FACE site, see below). Amongst the whole range of vegetation types that have been looked at so far, the most consistent responses are found in well-fertilized pastures and crop systems, which maintain more of the enhanced growth rate. However, even these agricultural systems do show some decline after an initial burst of response to C02.
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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.