 ecological problems, resource depletion, first the contents, the natural resources and depletion of natural resources. If we talk about ecological issues, ecological problems, they are three, mainly there are three ecological problems, human population, environmental pollution and the depletion or shortage of the resources. First we will talk about what are the natural resources. So natural resources are all type of things present in natural environment which can be utilized by human for its benefits. The environment can that, whatever is present and the human is used for its benefits, that is actually the natural resource. So important natural resources, we are talking about, they are the fossil fuels, then there's the minerals, then it is the air, it is the water, it is the land and the biodiversity. Fossil fuels, gas, natural gas is there, then the coal is there and the petroleum is there. Minerals, minerals mean different types of metals and non-metals which we are getting from the, as a fast-force iron, copper, gold and silver. Similarly, in a water, you are getting a lot of the family here. So how these resources are going to deplete? This is a major issue of the depletion of resources. If we just look at it, most of resources they are present in a limited amount in our land. On our earth, this is a limited amount. So when they are over-exploited, when the human population increases, the resources will be over-exploitation. So over-exploitation ultimately, these resources will start to deplete. Depletion means work will start and one step will come to an end. So the major cause of resource depletion is the human being, the human population itself. Increasing human population, it is actually reducing the resources. What does the resource do? Decrease. Yes. Increased population, second factor, important factor is a better lifestyle. If the population is increasing at a very low speed, the human needs are increasing because instead of the simplicity of life, we are going to a more comfortable place, to a more comfortable place. So that means the human needs are increasing. So when the requirements are met, ultimately, the requirements will be met with the environment and the environment will suffer. Now the simple thing is, if we look at the better lifestyle, if we, for example, in summer, if we use maximum acs in the summer, or if we look at it in the car, we use air conditions. What is the use of air conditions? Ultimately, the energy utilization is increasing. If we look at it previously, then previously, especially for this purpose, the energy was less used. So energy is the most requirement. What would that mean? That ultimately the resources will be depleted, will be overused, over-exploitation of fossil fuels. How is the over-exploitation of fossil fuels happening? Increased human population means more fossil fuels are required. And fossil fuels, they are present in a specific amount in the earth. So when they are more utilized, then ultimately, at one stage, it will be depleted. So this resource will be depleted. Minerals, metals or non-metals, iron, gold, copper, fast-force, they are present in a specific amount. So when they are over-exploited, what will happen? Depletes will end. Air. How will the air deplete? Now we say that we are breathing. The air should not be depleted. Air depletion means its quality is being damaged. It is the natural air, its quality is being damaged. The air is being toxic, it is being polluted. It may, at a stage may come when this air will no more be useful for humans. So it is said that at a stage, it is that we should use masks to survive. We have to do it as we do for fog. If we are in a toxic area where the air is polluted, we wear masks. In the future, the rapidly polluting situation is that we have to wear a mask to survive a normal life. So this is the major thing. So water pollution. Water depleting means that the water is either polluted too much because of water pollution when it is not water-usable. Ground water, when it is being used as much as water-table ultimately is going down. These are the things that are depleting because of water resource. Soil, biodiversity loss because we humans enjoy it is actually utilizing the natural resources. So habitat loss ultimately is a biodiversity loss. It is being depleted.