Tuesday, August 11, 2009
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State of India's environment sickening: report
The third official report on the state of India's environment, published after a gap of eight years and released by Minister of State for Environment and Forests Jairam Ramesh on Tuesday, has only one word of cheer: it says India is using 75 percent of the water it can use, and it has "just enough for the future if it is careful".
The report, prepared by NGO Development Alternatives under the aegis of the ministry, says 45 percent of India's land area is degraded due to erosion, soil acidity, alkalinity and salinity, waterlogging and wind erosion.
It says the prime causes of land degradation are deforestation, unsustainable farming, mining and excessive groundwater extraction.
On the bright side, the report shows how over two-thirds of the degraded 147 million hectares can be regenerated quite easily, and points out that India's forest cover is gradually increasing.
Ramesh said it would be unrealistic to expect that India's area under forests would go above the current 21 percent, given the competing demands for land. "Our plan is to have all this 21 percent as high and medium density forests within the next 10 years," he said. Currently, only two percent of India is under high density forest cover, while medium density forests cover about 10 percent of the land.
Presenting the salient features of the report to the media, Development Alternatives President (Development Enterprises) George C Varughese said one of its most worrisome findings was that the level of respirable suspended particulate matter--the small pieces of soot and dust that get inside the lungs--had gone up in all the 50 cities across India studied by the All India Institute of Medical Sciences and the Central Pollution Control Board.
"In these 50 cities, with their population of 110 million, the public health damage costs due to this was estimated at Rs.15,000 crore in 2004," Varughese said.
The main causes of urban air pollution were vehicles and factories, he pointed out, appealing for a major boost to public transport.
While India still had some cushion when it came to water use, this scarce resource would have to be managed very carefully, the report says. It identifies lack of proper pricing of water for domestic usage, poor sanitation, unregulated extraction of groundwater by industry, discharge of toxic and organic wastewater by factories, inefficient irrigation and overuse of chemical fertilisers and pesticides as the main causes of water problems in the country.
While India remains one of the world's 17 "megadiverse" countries in terms of the number of species it houses, 10 percent of its wild flora and fauna are on the threatened list, Varughese pointed out. The main causes, according to the report, were habitat destruction, poaching, invasive species, overexploitation, pollution and climate change.
The report points out that while India contributes only about five percent of the world's greenhouse gas emissions that are leading to climate change, about 700 million Indians directly face the threat of global warming today, as it affects farming, makes droughts, floods and storms more frequent and more severe and is raising the sea level.
In the section on urbanisation, the report points out that 20 to 40 percent of people living in cities are in slums. Varughese said there were good projects to upgrade their lives and improve the environment at the same time, but the problem was that most of the money from schemes like the Jawaharlal Nehru National Urban Renewal Mission was taken away by the big cities, "while the major problem is in about 4,000 small and medium towns".
Green and confused: What happens to old satellites?
Q.On the anniversary of the Apollo Moon landings, my eight-year-old son asked what happens to the old satellites and other debris in space. Will they eventually fall to Earth?
Your son has put his finger on what is becoming quite an environmental problem. First, tell him not to worry: he doesn’t have to go round with a hard hat on for fear of a wayward satellite flattening him. Most space debris, if it falls back to Earth, burns up as it re-enters the atmosphere.
However, there is a great deal of junk out there, zooming along at speeds of up to 25,000mph. At such a velocity, a mere flake of paint can do considerable damage to a satellite. Nasa frequently has to mend windows on its spacecraft because of penetration by minuscule flying objects.
No one is sure of the exact amount that has accumulated since the launch of the first satellite, the Soviet, in 1957, but over the years, millions of pieces of debris from space missions and satellites have contributed to what has become a revolving scrapyard way above our heads. Objects range from jettisoned spacecraft parts to tiny fragments of fuel and urine.
A United Nations body called the Inter-Agency Debris Co-ordination Committee uses sophisticated radar and monitoring equipment to track the debris and is able to detect objects (about 9,000) bigger than a tennis ball. Smaller objects can’t be tracked but are growing in number. One of the problems is that as these objects collide or break up, more debris is created. A discarded launch arm can wipe out a multimillion-dollar satellite. A bolt dropped during a space station repair could puncture the skin of a spacecraft and cause a catastrophe.
On occasions a space launch has had to be delayed until scientists were certain that the rocket would enter a “junk-free” zone. Now engineers are looking for ways to vaccuum up the debris before disaster strikes. It’s a bit like the mounting pile of rubbish deposited on Everest by climbers — the more we explore, the more junk is amassed. Man leaves an environmental footprint everywhere, even in space.
'Spiderbots' talk amongst themselves inside active volcano
squadron of 'spiderbots' inside Mount St Helens is the first network of volcano sensors that can automatically communicate with each other and with satellites, rather than sending data to a base station first.
Since the system can route data around any sensors that break and can simply be dropped into volcanoes, it is more robust and easier to deploy than current sensor systems, which must be carefully set up by hand.
Similar networked robots could one day be used to study geological activity elsewhere in the solar system, say scientists from NASA's Jet Propulsion Laboratory, which helped develop and monitor the robots.
Fifteen spiderbots, so-named because of the three spindly arms protruding from their suitcase-sized steel bodies, were lowered from a helicopter to spots inside the crater and around the rim of Mount St Helens, an active volcano in the US state of Washington, in July.
Each has a seismometer for detecting earthquakes, an infrared sensor to detect heat from volcanic explosions, a sensor to detect ash clouds, and a global positioning system to sense the ground bulging and pinpoint the exact location of seismic activity.
Once in place, the bots reached out to each other to form what is known as a mesh network. "It's similar to the internet," says Steve Chien, the principal scientist for autonomous systems at JPL. "You just lay them out, and they figure out the best way to route the data."
Self-healing
Other robotic volcano-monitoring systems exist, most notably around Mount Erebus in Antarctica. But they require permanent sensors to be buried in the ground or drilled into rock, which can take days of dangerous human labour.
The spiderbots are flexible and inexpensive enough that they can be set down almost anywhere. "You can imagine just dropping these out of a helicopter, and they'll just land like spikes in the ground and do their thing," Chien says.
The spider web's unique networking capabilities also give it a distinct advantage over other monitoring systems. The network is self-healing – if one node dies, the others automatically route data around it.
The scientists added this innovation after several early models were boiled, crushed or knocked over in the volcano's 2004 eruption. They also made the hardware more resilient. "These are much more rugged," says Rick LaHusen of the US Geological Survey. "They can take an impact and keep on working."
Space link
The network analyses data on the spot before sending it back to its base station at the nearby Johnston Ridge Observatory, allowing the spiderbots to provide real-time risk assessment – crucial in the event of an eruption.
"Scientists can sit in their office, and see through the internet what happened at Mt St Helens one second ago," says WenZhan Song of Washington State University in Vancouver, the principal investigator of the project.
It is also the first of its kind to communicate with a satellite.
The network can call the satellite to take pictures if it senses an unusual tremor, or the satellite can ask the network to focus its attention on a particular spot if it sees an anomalous heat source. "There's an autonomous interaction between the ground and the space systems – no people are needed," says LaHusen.
Europa submarine
The satellite link also lets scientists control the spider web from a distance. "We can upgrade lots of spiders by one mouse click," Song says.
The self-organising, self-healing, remotely controllable network would be essential for using similar robots on other planets or their moons, where scientists can't carefully place each sensor or replace one if it breaks.
Chien imagines using a similar network to study seismology on Mars or explore hydrothermal vents in the ocean thought to lie below the surface of Jupiter's icy moon Europa.
"In the Mount St Helens case, when it sees something interesting, it calls in satellite observations," Chien says. "On Europa, you might imagine you'd have a submarine that places sensors on these hydrothermal vents, and they call the mothership when they see things."
http://brightcove.newscientist.com/services/player/bcpid1873822884?bctid=33323552001
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