poniedziałek, 22 stycznia 2018
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Ekologia (424)

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! EN_90263812_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Illustration depicting the 'greenhouse effect'. The build-up of certain gases in Earth's atmosphere traps an increased amount of solar radiation & leads to a gradual warming of the whole planet. The 'greenhouse' gases include carbon dioxide, methane, nitrous oxide & chlorofluorocarbons (CFCs). They are generated by a wide variety of human activities, including industry, the burning of fossil fuels, increased agriculture & modern agricultural methods, & deforestation. Global warming is expected to cause massive changes in weather patterns & a rise in sea level (due to the melting of polar ice) that could flood coastal cities & plains.
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! EN_90269017_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Montage showing aerosol can spraying the world. Aerosol sprays are powered by chemicals called chlorofluorocarbons (CFCs). There is growing evidence that CFCs rise high into the atmosphere & deplete the ozone layer which protects us from the Sun's ultraviolet radiation. Chemical reactions triggered by CFCs have been implicated in the 'ozone hole' that has appeared recently over Antarctica each austral spring (September- October). Because increased ultraviolet is a threat to human health, notably as a cause of skin cancer, an international treaty to limit production of CFCs was signed in 1987. CFCs are also used in refrigerants & fast-food packaging. Yellow space-filled map of Earth on yellow grid. Blue wedge for spray.
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! EN_90263813_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Illustration of the 'greenhouse effect'. The build-up of certain gases in Earth's immediate atmosphere - the trophosphere - traps an increased amount of solar radiation & leads to a gradual warming of the whole planet. Here, a polluted trophosphere is represented by the purple band, allowing only a small fraction of re-radiated solar energy (yellow arrows) to return to space. The 'greenhouse' gases (chiefly carbon dioxide, nitrous oxide & methane) are generated by a wide range of human activities. Global warming is expected to cause massive changes in weather patterns, resulting in floods, droughts & drastic shifts in global food production.
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! EN_90263827_0001 SCI
PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Illustration of the 'greenhouse effect'. The build-up of certain gases in Earth's atmosphere traps an increased amount of solar radiation & leads to a gradual warming of the whole planet. The 'greenhouse' gases include carbon dioxide, methane, nitrous oxide & chlorofluorocarbons (CFCs). They are generated by a wide variety of human activities, including industry, the burning of fossil fuels, increased agriculture & modern agricultural methods, & deforestation. Global warming is expected to cause massive changes in weather patterns & a rise in sea level (due to the melting of polar ice) that could flood coastal cities & plains.
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