Environmental problems
Környezeti problémák - angol nyelvű tételkidolgozás - itt készült: KJF - terjedelem: 5 oldal
részlet:
Greenhouse effect
In the last 100 years the Earth’s surface has warmed up by more than half a degree, this change could cause rising the sea levels by up to one and half meters by the year 2030. The Greenhouse effect is caused by polluted atmosphere which was polluted by carbon dioxide from fossil fuels and chlorofluorocarbons.
The best protection is to stop producing these gases and destroying rain forests. It is worth replacing old power plants with nuclear power which reduce the damage. Also nuclear power has its disadvantages, in this case there are alternative sources of energy : hydropower, solar power, geothermal etc.
Ozone Hole
The ozone gap is thinning at a rapid speed. It is a layer which protect us from dangerous UV rays, these could damage the life on the Earth.
Possible effects of the sun’s UV rays:
Eyes: cataracts and blindness
Skin: premature aging, skin cancer and wrinkling
Immune system: they brake down the immune system
Crops: they could interrupt the process of photosynthesis
Sea life: growth of plankton which are a vital part of the food chain in the world’s oceans. The areas of largest ozone hole are Antarctica, South America, Australia, New Zealand. The main destroyers are CFC and halons which are used in refrigerators and air conditioners. Scientists estimate that one atom of chlorine can destroy 100 000 ozone molecules.
