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Published: Sunday 28 July, 2013

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However, human activities such as burning fossil fuels for heat, electricity, transportation, industry, an cheap longchamp le pliage bags d other purposes, are increasing the levels of carbon dioxide in the atmosphere.

Carbon dioxide, methane, nitrous oxide, and other gases are known collectively as greenhouse gases because they trap heat in the atmosphere. Most scientists believe the increasi cheap longchamp le pliage bags ng levels of carbon dioxide and other greenhouse gases is causing global climate changes that could melt ice caps, raise sea levels, create deserts, and intensify adverse and unpredictable weather conditions such as tropical storms.

To understand the role that rising carbon dioxide levels might have on plant growth, Curtis and his colleagues pulled together data from 159 studies published over the last 20 years. These studies detailed the effects of higherthanusual carbon dioxide levels on 79 plant species. The species included domesticated crops such as corn, cotton, wheat, and rice, as well as wild plants such as heath plants blueberry and cranberry, for instance, wild radish, plantains, and pasture grasses.

Other researchers have s cheap longchamp le pliage bags ummarized the positive effect of elevated carbon dioxide on leaves, stems and roots, said Curtis, but few have examined the overall effects on the reproductive traits of plants and fruit number, size, and nutritional quality. cheap longchamp le pliage bags