please provide a speech on how climate change has impacted the world. 

Such questions are meant to test your writing skills and should be attempted on your own. However, these points might help you elaborate:

- It is definitely true that we are facing the biggest threat from the freak weather conditions being witnessed all over the world: extended winters, sudden downpours, dry monsoons, extreme temperatures in summers, etc.
- Global warming has become a reality we have to deal with.
- Climate change has happened due to some natural phenomena, but mainly due to the irresponsible actions of humans.
- Their abuse of natural resources, over-use of gadgets and machines that emit harmful, toxic gases into the atmosphere, senseless deforestation, etc. have led to negative climate changes!
- Unless this progressively increasing bad weather and climate changes are contained, man's very existence is under threat.
- Already, many plant and animal species have gone extinct; dinosaurs had been wiped out from the face of the earth probably with sudden and extreme climate changes in their habitat.
- A similar fate may be lying in wait for the human race unless he can mend his ways and preserve the environment.  
- Elaborate the hazards or negative effects of this climate change: floods, droughts, heat waves, frequent wildfires, etc.
- Also mention some steps that can be taken to prevent such climate change: afforestation, 'reduce, reuse and recycle' resources, preserve and conserve natural resources, use of alternate sources of energy, renewable sources of energy to be utilised, etc.
- Renewable sources of energy are solar energy, wind power, electricity produced through turbines run by using water, etc.
- Mention that these changes are no more something that may happen in the future, but have become visible now; so, there is urgent need to act NOW!
- You may end with an effective relevant quote: William Hague has aptly said, "We have to face the reality of climate change. It is arguably the biggest threat we are facing today."     

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what speech

 
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