But, today environment is changing very fast and species are finding very difficult for itself to adjust with this change. As aresult, the rate of extinction has become very fast. Since the age of modern industrialization, the demand of energy has increased many folds, which we have been obtaining by burning natural resources like firewood, coal and petroleum. There is no denial to the fact that human activities like burning of fossil fuels, deforestation and consequent pumping of gases like carbon dioxide into atmosphere have been responsible for the earth getting hotter and hotter. This has causes a great reduction in the amount of carbon dioxide taken in by plants for photosynthesis and secondly, burning releases huge quantities of carbon dioxide into the atmosphere. This fact is important because carbon dioxide is one of the main greenhouse gase implicated in the current global warming. Average global temperatures have been showing a steadily increasing trend. Snow and ice cover have decreased, deep ocean temperatures have increased and global sea levels have risen by 100 – 200 mm over the last century. If current trends continue, scientists predict that the earth could be on average 1oC warmer by 2025 and 3oC warmer by 2100. These changes, while small, could have drastic effects on the earth’s dynamic system as a whole.
Today, there are threats to our planet arising not only from climate change but the degrading environment, declining availability of fresh water, rivers running dry before they can reach sea, loss of fertile land due to degradation, depleting energy sources and exponentially growing population are the other factors which are posing serious threats to the fragile ecosystem of earth. The pressure on the natural resources is so large as the amount of resources needed to sustain it exceeds what is available. In short, we are, consuming much more than what the earth can sustain. All this has posed a serious challenge to the very existence of life on the earth. If the current rate of exploitation of the natural resources of the earth continues, then it will be dangerous for 12,000 species of wild life and vegetation on earth. If the temperature rises by 1.5-2.7 degree Celsius by the end of the century, then nearly 20-30% of the flora and fauna will become extinct.
In a conference on bio-diversity held in Bann city (2008), International Union for Conservation of Nature (IUCN) has estimated that approximately three species are being extinct every hour due to increasing pollution. Due to the destruction of their natural habit, one out of every four mammalian species is facing the problem of extinction. It includes Chimpanzee and Elephant. One out of every eight species of bird; every third amphibian and 70% of the plants are facing the extinction. According to an estimate, there would be no surviving frog species by 2038.
We the higher up in the ladder of evolution, by controlling and changing the environment to suit its needs and for development are posing a great threat to the earth system as a whole. The species are being destroyed at faster rate now than they were earlier. This fact has been further supported by the studies done on fossils. Presently more than 30% species of all amphibian species; 23% of all mammals, and 12% of all birds are facing the problem of survival. The natural scavengers such as vultures are already at the verge of extinction.
Large-scale habitat and biodiversity losses mean that species with potentially great economic importance may become extinct forever before they are even discovered. The vast, largely untapped resource of medicinal plants and useful chemicals contained in wild species may also disappear with them. Same is true to marine species; especially those defend themselves chemically and could be a rich potential source of new medicines. Additionally, if the wild relatives of our cultivated crops, which are a valuable reservoir of genetic material, are lost, then our crop plants will also become more vulnerable to extinction. This will pose a serious problem to our food security.
If we need to understand and preserve our environment, we shall need to understand the interdependence of the species on each other and the importance of natural resources for living beings. Individual species and ecosystems that have evolved over millions of years had form a highly complex web of interdependence like the interlocking pieces of Jigsaw puzzle where each species is an interlocking piece. If we remove enough of the key species on which the ecosystem is sustaining, then the whole ecosystem may be in danger of collapsing. The problem becomes complicated further, when we do not have much idea as how many pieces (species) we can afford to lose or even how many are the key species on which the entire ecosystem is sustaining.
To draw the attention of the world to the importance of biodiversity, why it needs to be conserved and the threats to biodiversity, the United Nations has declared the year 2010 as “The Year of the Biodiversity”. It is hoped that with the cooperation of all, we shall be able to save the biodiversity and the life on this earth. A host of activities and programmes are being organized all over the world for this purpose. Vigyan Prasar has also initiated programmes with activities built around the theme “Biodiversity” as the issue is more pertinent to India being a country of mega biodiversity but with a challenge of feeding a population of billion plus. The activities comprise of development and production of a series of informative booklets, posters, CDs, radio and television programmes, and CD-ROMs; and training of resource persons in the country in collaboration with other agencies and organizations. Special programmes capsules and modules for VIPNET clubs are being developed. The information soon will be published in the forthcomming issues of VIPNET News. It is expected that the all these yearlong programmes and activities would be welcomed by science communicators, science clubs, resource persons, and individuals; and inspire them initiate actions to save and conserve biodiversity of this fragile abode of ours.