Two problems related to sustainable development are:
1. Resource Depletion: As the global population increases, the demand for natural resources such as water, energy, and raw materials also rises. Overuse of these resources leads to depletion, threatening the ability of future generations to meet their needs.
2. Environmental Pollution: Industrialization and urbanization have led to the pollution of air, water, and soil. This pollution harms ecosystems, endangers wildlife, and contributes to climate change, making it difficult to achieve sustainability goals.
On the day of her examination, Riya sharpened her pencil from both ends as shown below. 
The diameter of the cylindrical and conical part of the pencil is 4.2 mm. If the height of each conical part is 2.8 mm and the length of the entire pencil is 105.6 mm, find the total surface area of the pencil.