Topic. Independence of Uzbekistan

be worried about – to feel nervous and upset because you keep thinking about a problem that you could have in the future;

pollution – the process of damaging the air, water, or land with chemicals or other substances;

dirty – not clean or is polluted;

waste – the useless materials, substances, or parts that are left after you use something;

dangerous – likely to have a bad effect or to cause a problem;

exhaust fumes – gases or steam produced by an engine as it works;

tropical rain forests – a forest in a tropical region of the world where it rains a lot. Rainforests are considered to be important environmental as they produce a large amount of oxygen on earth;

carbon dioxide – the gas formed when carbon is burned or when people or animals breathe out;

be recycled – to change waste materials so that they can be used again;