In the current senerio of Nepal, different developmental activities have invited number of environmental problems like loss of forest, forest degradation, soil erosion, air pollution, water pollution and unmanaged solid-waste. It is obvious that environmental activites and its management in development planning have an important role in managing and controling poverty reduction. Inorder to control environmental hazards, the Government, various NGOs, & INGOs have highly targeted for imolementation from policy and various legislative factors with different economic sides.The writing highlights shortly about the present main environmental issues in Nepal. The following are some of the major devastating concequences that can be invited by unplanned rural development activities:Acidification: It can be considered as the gradual lowering of soil and pH value of the water because of acid deposition and acid persuation; this process negatively effects environment.Acid rain – It is taken as the condition where harmful level of sulfur dioxide and nitrogen mixes up.Due to that acid rain is caused.It is not only negative to humans but also and hazardous to the earth’s layers.Aerosol – Various harmful particals in the layer of air that can cause various health releated problems, mostly resperatory.Asbestos – In this condition, varuous naturally happening fibrous minerals which are used in construction items that are very carcinogenic in envirioment get into the nature and harm the health. Symptoms of asbestos are shortness of breath and a dry noisr in the lungs while walking.Loss of Biodiversity – Loss of biodiversity can be seen as various number of species start to distinct due to the unnessarry use of harmful items and unscientific plans. Gradually, biodiversity minimizes the environment’s ability to fight from natural or artificial happenings.Negative Fluctation of Carbon cycle – When various steps that are not sustainable are taken the exchange of carbon in the atmosphere and various ocean including numerous environments get unbalanced which obviously causes the the environment cycle from climate like abnormal rainfall or dry land. Plants loosing their oraginality with use of Defoliants – As unplanned and less scientific steps are taken in thr name of development, various harmful chemicals are used.One of them is defoliant.It can causea plant to lose their structurr and artificially make the leaves fall. These are often cobsudered in the process of agricultural practices, yet humans have nit been able to cobtrol its use.Thus it had caused detrimental effects on human and environment.Deforestation – As there is a mis conceptation that development requires houses and buildings,people have started cutting down of trees in a very high number.Which has not only effected the soil but has already caused priblems like soil erosion and landslide.As a result,it is directly negative for the nature.Desertification – As the demand of wood is very high and humans have started to cut down forests to make roads, the greenary can be seen extinctingrapidly as there are cemented buildings where there used to be trees and wild life.Thus, desertification is highly seen.Dredging – the practice of deepening an existing waterway; also, a technique used for collecting bottom-dwelling marine organisms (e.g., shellfish) or harvesting coral, often causing significant destruction of reef and ocean-floor ecosystems. Drift-net fishing – done with a net, miles in extent, that is generally anchored to a boat and left to float with the tide; often results in an over harvesting and waste of large populations of non-commercial marine species (by-catch) by its effect of “sweeping the ocean clean.” Ecosystems – ecological units comprised of complex communities of organisms and their specific environments. Effluents – waste materials, such as smoke, sewage, or industrial waste which are released into the environment, subsequently polluting it. Endangered species – a species that is threatened with extinction either by direct hunting or habitat destruction. Freshwater – water with very low soluble mineral content; sources include lakes, streams, rivers, glaciers, and underground aquifers. Greenhouse gas – a gas that “traps” infrared radiation in the lower atmosphere causing surface warming; water vapor, carbon dioxide, nitrous oxide, methane, hydrofluorocarbons, and ozone are the primary greenhouse gases in the Earth’s atmosphere. Groundwater – water sources found below the surface of the earth often in naturally occurring reservoirs in permeable rock strata; the source for wells and natural springs. Highlands Water Project – a series of dams constructed jointly by Lesotho and South Africa to redirect Lesotho’s abundant water supply into a rapidly growing area in South Africa; while it is the largest infrastructure project in southern Africa, it is also the most costly and controversial; objections to the project include claims that it forces people from their homes, submerges farmlands, and squanders economic resources. Inuit Circumpolar Conference (ICC) – represents the 145,000 Inuits of Russia, Alaska, Canada, and Greenland in international environmental issues; a General Assembly convenes every three years to determine the focus of the ICC; the most current concerns are long-range transport of pollutants, sustainable development, and climate change. Metallurgical plants – industries which specialize in the science, technology, and processing of metals; these plants produce highly concentrated and toxic wastes which can contribute to pollution of ground water and air when not properly disposed. Noxious substances – injurious, very harmful to living beings. Overgrazing – the grazing of animals on plant material faster than it can naturally regrow leading to the permanent loss of plant cover, a common effect of too many animals grazing limited range land. Ozone shield – a layer of the atmosphere composed of ozone gas (O3) that resides approximately 25 miles above the Earth’s surface and absorbs solar ultraviolet radiation that can be harmful to living organisms. Poaching – the illegal killing of animals or fish, a great concern with respect to endangered or threatened species. Pollution – the contamination of a healthy environment by man-made waste. Potable water – water that is drinkable, safe to be consumed. Salination – the process through which fresh (drinkable) water becomes salt (undrinkable) water; hence, desalination is the reverse process; also involves the accumulation of salts in topsoil caused by evaporation of excessive irrigation water, a process that can eventually render soil incapable of supporting crops. Siltation – occurs when water channels and reservoirs become clotted with silt and mud, a side effect of deforestation and soil erosion.Slash-and-burn agriculture – a rotating cultivation technique in which trees are cut down and burned in order to clear land for temporary agriculture; the land is used until its productivity declines at which point a new plot is selected and the process repeats; this practice is sustainable while population levels are low and time is permitted for regrowth of natural vegetation; conversely, where these conditions do not exist, the practice can have disastrous consequences for the environment . Soil degradation – damage to the land’s productive capacity because of poor agricultural practices such as the excessive use of pesticides or fertilizers, soil compaction from heavy equipment, or erosion of topsoil, eventually resulting in reduced ability to produce agricultural products. Soil erosion – the removal of soil by the action of water or wind, compounded by poor agricultural practices, deforestation, overgrazing, and desertification. Ultraviolet (UV) radiation – a portion of the electromagnetic energy emitted by the sun and naturally filtered in the upper atmosphere by the ozone layer; UV radiation can be harmful to living organisms and has been linked to increasing rates of skin cancer in humans. Water-born diseases – those in which bacteria survive in, and are transmitted through, water; always a serious threat in areas with an untreated water supply.