Conservation Is About More Than Saving Species From . . . They put the global species total at about 8 7 million, of which roughly 7 7 million are animals Some 157,000 species have been systematically evaluated by scientists to determine whether they
Extinction - The Mainstay of Life on Earth - Wildlife . . . Life on the planet has been prodded and shaped by five major mass extinction events over the last 500 million years which have been responsible for erasure of 70 percent to 96 percent of species each time, and each time the surviving species have had to recover, reassemble and start from the beginning
Description of the Hydrologic Cycle - National Oceanic and . . . The reservoirs provide 142 cubic miles of storage, almost 90% of which occurs in 600 of the largest reservoirs Also, there are approximately 50,000 reservoirs ranging from 50 to 5,000 acre-feet in storage It is also estimated that there are about 2 million farm ponds in the United States
Tipping points in the climate system - Wikipedia This frozen ground holds vast amounts of carbon from plants and animals that have died and decomposed over thousands of years Scientists believe there is nearly twice as much carbon in permafrost than is present in Earth's atmosphere [63]
The asteroid that wiped out the dinosaurs caused a . . . Sixty-six-million years ago, a nearly nine-mile-wide asteroid collided with Earth, sparking a mass extinction that wiped out most dinosaurs and three-quarters of the planet’s plant and animal
Biodiversity: Why the nature crisis matters, in five graphics Human activities are destroying the natural world, leading to the extinction of animal and plant species at an alarming rate Now, world leaders are promising action to tackle the problem