Look at the pictures, then read the text quickly. What is the main idea? Circle one of the options below (Nhìn vào hình ảnh, sau đó đọc văn bản một cách nhanh chóng. Ý tưởng chính là gì? Khoanh tròn một trong các lựa chọn bên dưới)

A. Fossial fuels

B. Green sources of energy

We use fossil fuels in our daily life, but they are limited and cause pollution. A lot of scientists are working hard to look for some lossless and environmentally friendly sources of energy.

Solar energy is not new to us because we use it to dry things every day. Solar panels catch sun rays and change them into electricity. We know that it is renewable because the sun never stops producing sunlight.

Wind power is also an old source of energy. In the past, explorers used wind for sailing their ships to distant lands. A single windmill can pump water and generate electricity. To get much more power all at once, people install lots of giant wind turbines on wind farms.

If we stop using fossil fuels, our planet will be greener. There is nothing to lose when we use solar energy or wind power.