Recommended
More Related Content
What's hot
What's hot (20)
Similar to Disasters
Similar to Disasters (18)
Recently uploaded
Recently uploaded (20)
Disasters
- 1. ARE DISASTERS MORE MAN MADE THAN NATURAL ? BY: MITASHA SAINI
- 2. IS MAN RESPONSIBLE FOR MOST OF THE DISASTERS? MAN FAMINES FLOODS FIRES DROUGHTS CYCLONESEPIDEMICS GLOBAL WARMING OZONE LAYER DEPLETION LANDSLIDES
- 4. Age of the Earth : 4500 million years Arrival of Human: 0.2 million years ago
- 8. More than 90 percent of all organisms that have ever lived on Earth are extinct. More than 90 percent of all organisms that have ever lived on Earth are extinct.
- 9. •"It's not easy to kill so many species," says Doug Erwin, a Smithsonian Institution paleontologist. "It had to be something catastrophic."
- 11. First Case: Ordovician • 444 million years ago. Second largest extinction • 85% of sea life wiped out Reasons • Drift of the supercontinent Gondwana • Global cooling (5,00,000 year long Ice Age) • Fall in sea level • Oxygen depletion • Toxic metals unleashed by depleted oxygen in the ocean (source: BBC & National Geographic)
- 13. COMPARISON OF ORDOVICIAN WITH MANMADE DISASTERS ORDOVICIAN TOXIC FALLOUT FROM WARS 445 MILLION YEARS AGO AROUND 10-15 YEARS AGO MILLIONS OF CREATURES DIED DUE TO HEAVY METALS THOUSANDS OF DEATHS DUE TO HEAVY METAL GENETIC DEFECTS IN ORGANISMS CHILD BIRTH DEFECTS
- 14. Deformities in creatures during Ordovician Era Child birth defects in Iraq
- 15. Second Case: Permian • 250 million years ago. The largest extinction in Earth's history. • 95% of existing species were wiped out • All life on Earth today is descended from the 5% of species that survived. Reasons • Vast eruption of the Siberian Volcanic Traps • Rapid Global Warming
- 17. SHOCKING FACTS OF PERMIAN ERA Volcanic eruptions continued for 1 million years The eruptions burned forests four times the size of Korea The global warming lasted for approximately 10 million years. 95% of the population of life on the Earth perished The recovery took almost 10 million years
- 19. COMPARISON OF PERMIAN WITH MANMADE DISASTERS PERMIAN PERIOD CURRENT SCENARIO 250 MILLION YEARS AGO – VOLCANIC ERUPTIONS RECENT GLOBAL WARMING MILLIONS OF CREATURES DIED (95% OF EXISTING POPULATION) DUE TO GLOBAL WARMING & VOLCANIC ERUPTIONS THOUSANDS OF DEATHS DUE TO GLOBAL WARMING DUE TO HEAT WAVES, CLIMATE CHANGES ETC.
- 20. THE LARGEST NUCLEAR WEAPON EVER DETONATED, THE TSAR BOMBA, RELEASED 0.2 QUINTILLION JOULES OF ENERGY 28-MILLION-YEAR- OLD ERUPTION INVOLVED OVER 1,050 QUINTILLION JOULES OF ENERGY
- 21. • Even the most murderous disasters in human times will not even begin to match up to the most deadly, powerful events in the world’s ancient past – events called “mass extinctions”.
- 22. NATURE IS OMNIPOTENT • As seen from previous slides, Nature takes its own course • Mass Extinctions/Disasters are part of the Nature’s course • Extinction of previous species lead to evolution of new species including Humans • Nature is originator and destroyer
- 24. SIXTH/HOLOCENE EXTINCTION• We have reached the 6th mass extinction • Fastest in the Earth history • The current rate of extinction of species is estimated at 100 to 1,000 times higher than natural background rates due to human interventions • By the year 2100, more than half of the world's marine and land species will become extinct extinction.
- 25. Conclusion • Nature will take its own course • There will be natural disasters of large scale • Some species will extinct while some others will evolve • Manmade disasters are aggravating/pacing up the sixth extinction • Manmade disasters are totally avoidable and we should relish what nature has given us before it decides our fate
- 26. • THANK YOU