If no action is taken the greenhouse effect could lead to a rise in average global temperatures of between 0.3-0.7 degrees Celcius as early as the year 2035. These rises will be greater towards the poles and less at the tropics. There will also be more warming in winter than summer. In another 100 years such continued increases will make the world hotter than it has been for more than 100,000 years. The rise will also be faster than ever before; a rise of 3 degrees Celcius after the last ice age took thousands of years. The effects are already showing - the ten hottest years globally have all occurred since 1998.
Storms - Storms, tornadoes and hurricanes will become more frequent and stronger as oceans heat up causing more water to evaporate. Evidence is building up at an alarming rate. Tornadoes have been seen on all continents on earth except Antarctica but the United States has the most tornadoes of any country due to its size, location and geography. In 2011, in just one week a record-breaking 362 tornadoes devastated southern states of the USA killing up to 350 people.
Droughts - As temperatures rise, some areas will become dryer and water sources will evaporate or be used up sooner than they are replenished. With such little rainfall rivers, streams and reservoirs runn dangerously low, yet continues to be used up in our homes and for farming, building and industry.
Floods - Long-term measurements of tide gauges and recent satellite data show that global sea level is rising, with the best estimate of the rate of global-average rise over the last decade being 3.6 mm per year. Continued rises in sea level will cause increased flooding in coastal areas and river estuaries such as Bangladesh and the Nile Delta. London and many other British coastal cities will be threatened also. It is now a priority to strengthen Britain's sea defences.
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