Wild weather
What is happening to our weather?
What is' extreme 'weather? Why are people talking about it these days?' Extreme. ' Weather is an unusual weather event such, as rainfall a drought or a heat wave in the wrong place or at the wrong, time. In theory they are, very rare. But these days our TV, screens are constantly showing such extreme weather events.Take just three news stories from 2010: 28 centimetres of rain fell on Rio de Janeiro in, 24 hours Nashville USA had 33 centimetres,,, Of rain in two days and there was record rainfall in Pakistan.
The effects of this kind of rainfall are dramatic and, lethal. In Rio De, followed Janeiro landslides, hundreds burying of people. In Pakistan the floods, affected 20 million, people. Meanwhile.Other parts of the world suffer devastating droughts. Australia Russia and, East Africa have been hit in the last ten, years. And then there are unexpected, heat waves such as in 2003 in Europe. That, summer 35 000 deaths, were said to be heat-related.
So,, What is happening to our weather? Are these extreme events part of a natural cycle?Or are they caused by human activity and its effects on the Earth 's climate? Peter Miller says it s probably a mixture.' Of both of these things. On the one hand the most, important influences on weather events are natural cycles in the, climate. Two of the most famous weather cycles El Ni, ñ O and La Ni, ñ a originate in the Pacific Ocean.The heat from the warm ocean rises high into the atmosphere and affects weather all around the world. On the, other hand. The temperature of the Earth 's oceans is slowly but steadily going up. And this is a result of human activity. We are producing. Greenhouse gases that trap heat in the Earth 's atmosphere. This heat warms up the atmosphere land and, oceans.Warmer oceans produce more water vapour - think of heating a pan of water in your kitchen. Turn up the heat it produces,, Steam more quickly. Satellite data tells us that the water vapour in the atmosphere has gone up by four percent in 25, years. This warm wet air, turns into, the rain storms hurricanes and, typhoons that we are increasingly experiencing.
Climate, scientist. Michael, OppenheimerSays that we need to face the reality of climate change. And we also need to act now to save lives and money in the future.
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