Read the passage and answer questions no. B. Humans can neither change the sun's radiation nor the earth's orbit around the sun. But they can control the increase in the amount of greenhouse gases and its effect on the atmosphere. Only during the last hundred years the carbon dioxide concentration has been raised alarmingly in the atmosphere and we humans can be held responsible for this. The main cause of the increase in carbon dioxide level in the atmosphere is the burning of fossil fuels. Since the [গণিত] the 19th century, industrial activities increased rapidly giving rise [গণিত] many factories. These factories required energy, which was produced through the combustion of coal. Besides coal, other sources of energy such as mineral oil and natural gas were also burned [গণিত] heat our houses, run cars and airplanes or [গণিত] produce electricity. Nowadays, about 85 million barrels of crude oil are burned daily. Every time a fossil raw material is bunted, it releases carbon dioxide into the air. Therefore, it is clear that more and more greenhouse gases like carbon dioxide are being generated worldwide by humans. Moreover, we are also strengthening the greenhouse effect by deforestation, which means cutting down trees. Every year enormous area of forests are destroyed by the people [গণিত] obtain wood and [গণিত] clear regions for mining and [গণিত] create pasture. This loss of the forest causes dual problems. Trees that are burned up release large volumes of carbon dioxide gas into the air. On the other hand, as forests absorb a lot of carbon dioxide from the air and deliver oxygen instead, we also destroy an important storehouse of carbon dioxide when we clear forests. B. Answer the following questions. (a) What is the effect of burning fossil fuels? (b) How can trees help save our environment? (c) When did mills and factories [গণিত] increase? (d) "Human beings are responsible for the greenhouse effect." Do you agree? Why/Why not? (e) What are the causes lying behind deforestation?

উত্তর: (a) Burning fossil fuels releases harmful gases like carbon dioxide, which causes air pollution and global warming. (b) Trees can help save our environment by absorbing carbon dioxide from the air and releasing oxygen instead. (c) At the [গণিত] the 19th century, mills and factories began [গণিত] increase. (d) Yes, I agree. Human beings are responsible for making the greenhouse effect deadlier. This happens mainly because we burn fossil fuels, which release carbon dioxide and other greenhouse gases into the air. These gases trap heat in the Earth's atmosphere and make the planet warmer. (e) Deforestation happens due [গণিত] a number of human activities. Cutting trees for wood, clearing lands for farming, building infrastructures, mining, etc. are some of the major reasons.

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