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1. I think that the world is polluted because of human activity. The industrial progress caused pollution of the environment. 2. The most serious problem of the environmental pollution is the activity of people during the last fifty or sixty years. 3. Yes, of course. The greenhouse effect influences the climate of the world because it causes the melting of ice in the North and it may change the climate as a whole. 4. Everything in our world is connected to each other. I think deforestation is very dangerous for people and animals because plants and trees give us oxygen to breathe. 5. It's very important to solve environmental problems as we should leave our planet clean and beautiful for future generations. We want our children to enjoy the beauty of the world.