Write an essay about the causes and effects of global warming and possible solutions.
Introduction: (Introduce the topic & the main content of the essay)
- one of the biggest issues facing humans nowadays
- caused mainly by humans
- most catastrophic effects on humans
- humans have to take actions to reduce the risks
- the essay will discuss the causes and effects, and possible solutions
Body
1. Causes of global warming
- Carbon dioxide emissions from the burning of fossil fuels in power plans and motor vehicles
- deforestation for farmland, wood, and paper
- increasing use of chemical fertilizers on croplands
2. Effects of global warming
- heat-related illnesses and death, and spread of infectious diseases
- melting of polar ice caps and rising of sea level → People losing homes
- extreme weather patterns such as severe storms, heat waves, floods, and droughts → Water and food shortages
- widespread extinction of species
3. Some possible solutions
- reducing energy use
- planting trees or plants
- using green methods of transport
Conclusion
- Summarize the main points
- State your opinion
Hình em tự vẽ nhé.
Từ B ta kẻ BI vuông góc với ME, căt ME tại I. Dễ dàng chứng minh được tam giác BHI bằng tam giác EIH nên BH = EI.
Mà EI = ME+MI. Vậy để chứng minh: MD+ME=BH ta chỉ cần chứng minh MI=MD.
Do BỊ vuông góc EI, EI vuông góc với AC nên BỊ song song AC.
Vậy: \(\widehat{IBC}=\widehat{ACB}\)(hai góc so le trong).
DO tam giác ABC cân tại A nên \(\widehat{ABC}=\widehat{ACB}.\)Suy ra: \(\widehat{IBC}=\widehat{ABC}.\)
Xét tam giác BMD và tam giác BMI:
Có BM chung .
\(\widehat{IBC}=\widehat{ABC}.\)
\(\widehat{D}=\widehat{I}=90^o.\)
Vậy: \(\Delta BMD=\Delta BMI\)(ch. gn).
Suy ra: IM=MD. Vậy ta có điều phải chứng minh.
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