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Назовем наши прямые a и b (прямая а лежит выше прямой b), а секущую c. Соответственные углы назовем 1 и 2 (угол 1 образован пересечение прямых a и c, угол 2 образован пересечением прямых b и c),также возьмем во время доказательства угол 3, вертикальный углу 1.
Доказательство.
Углы 1 и 3 равны как вертикальные. А так как углы 1 и 2 равны по условию, то углы 2 и 3 равны между собой. Но углы 2 и 3 - внутренние накрест лежащие при прямых a и b и секущей c. А мы знаем, что если внутренние накрест лежащие углы равны, то прямые параллельны, что и требовалось доказать.

1) What is the greenhouse effect? Why is it dangerous?

The greenhouse effect is a process that occurs when gases in the Earth's atmosphere, such as carbon dioxide, trap the Sun's heat. This process makes  our planet much warmer than it would be without an atmosphere. The problem is that human activities are changing the Earth's natural greenhouse effect. Burning fossil fuels like coal and oil puts more carbon dioxide into our atmosphere and the rising temperature on the planet can lead to ice melting and climate change.

2) What climate do people have in Vladivostok?

Vladivostok has a monsoon-influenced humid continental climate.

3) Why are rainforests so important to the life on the Earth?

Rainforests are often called the lungs of the planet because they absorb carbon dioxide, a greenhouse gas, and produce oxygen, which is necessary for our survival. Rainforests also stabilize climate and are home to a lot of plants and wildlife.

4) What are the most important environmental problems?

They are global warming, acid rain, air pollution, waste disposal, ozone layer depletion, water pollution, climate change.

How can the problem of water pollution be solved?

Wastewater must be carefully cleaned (treated). There should be strict fines (штрафы) for those who pollute water.

5) What can cause air pollution?

Air pollution is caused by solid and liquid particles (твердыми и жидкими частицами) and certain gases that are suspended in the air. These particles and gases come from car and truck exhaust, factories, dust, volcanoes and wildfires.