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segunda-feira, 20 de janeiro de 2020

PALLADIUM: AIR POLLUTION CONTROL THREATENED!!!

More precious than gold: Why the metal palladium is soaring!
Reproduced from BBC News:
 https://www.bbc.co.uk/news/business-51171391




It has jumped by more than 25% in the last two weeks alone, and almost doubled in value over the last year.
At about $2,500 (£1,922) an ounce of palladium is more expensive than gold, and the pressures forcing its price up are unlikely to ease anytime soon.
What is palladium?
It is a shiny white metal in the same group as platinum, along with ruthenium, rhodium, osmium, and iridium.
The majority of the world's palladium comes from Russia and South Africa. Most of it is extracted as a byproduct in the mining of other metals, usually platinum and nickel.
It is also used, to a far lesser extent, in electronics, dentistry, and jewellery.
The metal's soaring value in recent years has seen a jump in the theft of catalytic converters around the world.
London's Metropolitan police said the number of thefts in the first six months of 2019 were more than 70% higher than the whole of the previous year.
Why is its price rising?
In short, it is because demand for palladium outstrips supply, and it has done for some time.
The amount of the metal produced in 2019 is forecast to be below global demand for the eighth year in a row.
As a secondary product of platinum and nickel extraction, miners have less flexibility to increase palladium output in response to rising prices.
And that shortfall looks set to continue, with South Africa, which produces around 40% of the world's supply, last week saying its output of platinum group metals, including palladium, fell by 13.5% in November compared to a year earlier.
Meanwhile, demand for palladium from car makers has increased sharply for a number of reasons.
Around the world governments, notably China, are tightening regulations as they attempt to tackle air pollution from petrol vehicles.
At the same time the diesel emissions scandal in Europe has also had an impact. Consumers there have been shifting away from diesel cars, which mostly use platinum in their catalytic converters, and are instead buying petrol-driven vehicles, which use palladium.
The US-China trade deal, which was signed earlier this month, has also boosted prices. Traders expect the agreement to help ease downward pressure on global economic growth and slow the decline in Chinese car sales.

quarta-feira, 15 de janeiro de 2020

AMAZON MONITORING SYSTEM: HOW DOES IT WORK?

https://imazon.org.br/en/imprensa/understanding-the-imazon-monitoring-system/

Reproduced from:  imazon.org.br




What is SAD?
The Deforestation Alert System is a tool for monitoring the Amazon based on satellite images, developed by Imazon in 2008, to provide monthly reports on the rate of deforestation and forest degradation in the region. Deforestation consists of total conversion of the soil for another land cover and use, while degradation is a partial disturbance in the forest caused by timber extraction and/or forest burning.
What satellites are used by SAD?
SAD currently uses Landsat 7 (sensor ETM+), Landsat 8 (OLI), Sentinel 1A and 1B and Sentinel 2A and 2b (MSI) satellites. By combining those satellites, it is possible to view the same area every 5 to 8 days. SAD prioritizes processing of images acquired on the last day of the month to detect and map the monthly deforestation alerts. Those satellites allow detection of deforestation events with 20 to 30-meter detail. Sentinel 1 also allows monitoring despite clouds, by using radar images. That allows the capacity for monitoring during the rainy season, when deforestation diminishes in the region. SAD detects areas of deforestation as small as 1 hectare.
Is it possible to compare the SAD and DETER systems?
The two systems generate monthly deforestation and forest degradation alerts, although the methodologies are different.
Does SAD monitor deforestation in secondary forests?
No, SAD detects and reports deforestation in primary forests.
Does SAD differentiate between legal and illegal deforestation? 
No. To do that, the alert detections must be combined with deforestation authorizations issued by federal, state and municipal agencies. The authorizations issued by state agencies are not in data systems that can be crossed with satellite images in time to do monthly monitoring. However, Mapbiomas Alert is already doing this type of crossing of databases (http://alerta.mapbiomas.org/lancamento-1) to estimate the proportion of illegality in.
View the July 2019 SAD bulletin here.

Imazon – Imazon is a Brazilian not-for-profit research institute, made up of Brazilian researchers, founded in Belém 29 years ago. Using its sophisticated Deforestation Alert System (SAD), for more than ten years the organization has been doing the work of monitoring and disseminating data on deforestation and degradation in the Brazilian Amazon, providing independent and transparent monthly alerts in order to inform changes in behavior that can lead to significant reductions in destruction of forests, in favor of sustainable development.