Read the following text and answer the questions no. 3 and 4:

Humans can neither change the sun's radiation for 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 end of the 19 century. Industrial activities increased rapidly giving rise to 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 to heat our houses, run cars and airplanes or to produce electricity. Nowadays, about $5 million barrels of crude oil are burned daily. Every time a fossil raw material is burned, 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 areas of forests are destroyed by people to obtain wood and to clear regions for mining and to 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.

Our Independence Day

26 March reminds us of the historic day in 1971 when Bangladesh declared its independence. It signifies the commencement of our nine-month-long Liberation War and the ultimate victory against oppression. The day is celebrated annually to commemorate the heroic struggle and immense sacrifices made by the people to achieve a sovereign nation.

26 March is observed as Bangladesh's Independence Day because on this day in 1971, the Father of the Nation, Bangabandhu Sheikh Mujibur Rahman, declared the independence of Bangladesh. This declaration ignited the Liberation War against Pakistan, leading to nine months of intense conflict. The day serves as a solemn reminder of the immense sacrifices made by millions of martyrs and freedom fighters who laid down their lives for the country's sovereignty. It is a day of national pride, remembrance, and renewal of the commitment to uphold the values for which the nation was founded.

The beginning of Independence Day celebrations.

The 31-gun salute is a ceremonial gesture that marks the official beginning of the Independence Day festivities in Bangladesh. It is a traditional military honor, serving as a symbol of respect and solemnity for the occasion. This salute commemorates the sacrifices made during the 1971 Liberation War and honors the birth of the nation. It sets a formal and respectful tone for the day's events, which include various cultural programs and tributes to the martyrs.

The cultural programmes held on Independence Day play a vital role in educating and inspiring the populace. They specifically highlight the arduous struggle and immense sacrifices made by the people of Bangladesh during the Liberation War of 1971. These events serve to remind everyone, especially the youth, about the historical context and the profound price paid to achieve the nation's independence, thereby reinforcing national pride and patriotism.

We pay homage to the martyrs by placing floral wreaths at the National Mausoleum at Savar and by participating in rallies and processions.

On Independence Day, it is a national tradition to pay tribute to the martyrs who sacrificed their lives for the country's freedom in 1971. This homage is primarily offered at the National Mausoleum in Savar, where the President, Prime Minister, other leaders, and people from all walks of life place floral wreaths. This act signifies the nation's profound respect and gratitude for their supreme sacrifice. Additionally, various rallies and processions are organized throughout the day, reinforcing the remembrance and celebration of their heroic struggle.

From this passage, we become inspired by the profound significance of Independence Day as a commemoration of the heroic struggle and immense sacrifices made in 1971 to achieve our nation's freedom. The description of nationwide celebrations with great enthusiasm, the respectful homage paid to martyrs at the National Mausoleum, and the various cultural programs highlighting the historical struggle and sacrifice, all instill a deep sense of patriotism and gratitude towards those who fought for independence. This reminds us of the importance of unity and determination in safeguarding our hard-earned sovereignty.