প্রকৃতিক দুর্যোগ বলতে আমরা যেটা জানি যে এটি প্রাকৃতিক ঝুঁকির ফল যা স্থানীয় সকল প্রতিরোধকে ভেঙে দিয়ে একটি অঞ্চলের সামাজিক ও অর্থনৈতিক উন্নয়নকে মারাত্মকভাবে প্রভাবিত করে। মূলত প্রাকৃতিক দুর্যোগের উপর মানুষের কোন নিয়ন্ত্রণ নেই। আমরা এটা বন্ধ করতে পারি না তবে আমরা যেটা করতে পারি তা হলো প্রাকৃতিক দুর্যোগের ব্যাপারে প্রস্তুতি নিতে পারি । তাছাড়া প্রাকৃতিক দুর্যোগের কারণে ক্ষতির পরিমাণ কমাতে আমরা নানবিধ পদক্ষেপ গ্রহণ করতে পারি ঐতিহ্যগতভাবে দেখলে দেখা যায় যে, প্রাকৃতিক দুর্যোগ মূলত কিছু প্রতিবন্ধকতা ও মানবিক প্রকৃতিতে কিছু সমস্যার সৃষ্টি করে। ঐসব প্রাকৃতিক দুর্যোগ প্রতিরোধ বা এড়ানোর একটি কৌশল রয়েছে যদিও বিজ্ঞানীগণ বলে থাকেন যে প্রাকৃতিক দুর্যোগ সম্পর্কে পূর্বাভাস দেয়ার কৌশল পাওয়া গিয়েছে, কিন্তু অধিকাংশ সময়ে তারা এই পূর্বাভাস দিতে ব্যর্থ হয়েছে যা বড় ক্ষতির কারণ ছিল।
Poverty is a big problem in our country. But often we can not realize that we are mainly responsible for this execrable situation. Many people do not try to develop their condition through hard labor and profitable businesses. Besides, they only lament over their distressed situation and curse their lucks. These idleness and indolence are needed to be wiped out. Poverty and woe will be excluded and peace and happiness will be our eternal partner if we stride our way of life keeping a noble sentence in mind that man is the creator of his/her own fortune.
Plastics are the materials that restrain rain water go into the soil which hampers the growth of plants.
As plastics are non-biodegradable, they do not mix up with soil, even they produce toxic gases and smoke when they are burnt. Thus it creates hazards for the environment.
Poisonous gases and smoke are produced when they are burnt.
Synthetic denotes a thing that is made by combining different substances which is not natural.
Plastics have some advantages and disadvantages. Disadvantages come from it's disposal process. So we need to dispose it appropriately.
Biological diversity refers to all of the different kinds of life on Earth. Also called biodiversity, biological diversity is often used to refer to the total number of different species on Earth. A collection of this biodiversity would include human beings, Bengal tigers, sugar maples, oyster mushrooms, bacteria, and the millions of other living organisms found on Earth.
It has been estimated that more than 50 million species of plants, animals and micro-organisms exist in the world. Out of these, about two million organisms have been identified so far. Our planet's requirement and services depend mainly on biological resources. Human society depends on biological resources, their diversity and the ecosystem that sustain them. Biological resources not only provide us nourishment, clothing, housing, fuel and medicine but also meet other requirements.
Loss of this biodiversity means we would not only lose rich and beautiful ecosystems but we might also lose plants and other organisms that could improve or enrich our lives. Already the tropical forests have provided humankind with food crops we enjoy daily such as tomatoes, peppers, corn, rice, coconut, banana, coffee, cocoa, cassava (tapioca), beans, and sweet potatoes, to name but a few. Tropical biodiversity has also provided us with many medicines used to treat such diseases as malaria.
Maintenance of ecological balance, conservation of natural resources and prevention of soil erosion may be considered as the examples of indirect use of biodiversity. The responsible factors for the loss of biodiversity may be natural or artificial. The natural causes include drought, flood, storm, land slides, diseases earthquake etc. The artificial causes include grazing, urbanization, industrialization, scientific and educational research, road and dam construction all leading to destruction of habitat and over exploitation of plants and animals for commercial purposes.