C02 Levels And Stomata Out In Nature

Perhaps the only really convincing evidence of a direct C02 effect occurring in nature is a change in stomatal indices of leaves (the stomatal index is the abundance of stomatal pores relative to normal epidermal cells in the leaf surface) over the past centuries. The stomatal index has been shown many times to decrease with increasing C02 concentration in experimental plants grown at different C02 concentrations. Ice core evidence, and old measurements of the C02 content of air, show that the atmospheric C02 concentration has been increasing since the early 1800s. Ian Woodward of Sheffield University was the first to show that over the last 200 years herbarium specimens of leaves of common trees (e.g.. beeches Fag us, birches Bctu/a) show decreasing stomatal indices that parallel the increase in C02. This finding has been repeated many times on herbarium specimens of other species gathered before and after the onset of the main C02 increase.

Renewable Energy 101

Renewable Energy 101

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.

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