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Tripa is part of the 2. When the Supreme Court rejected Kallista Alam's judicial review, the company appeared to have exhausted all its legal options. But it avoided payment by getting a legal protection order last year from the Meulaboh district court in Aceh which is responsible for enforcing the fine, according to a ministry document that details the court's numerous instances of apparent non-cooperation in the case.

The ministry said it is appealing the order at the Supreme Court. Activists who said they'd gathered , signatures on a petition against Kallista Alam, protested outside the Meulaboh court in January, media in Aceh reported. Kallista Alam could not be contacted. The phone number listed for it in an online companies database is inactive. Intensity also increases during daytime hours. Burn rates of smoldering logs are up to five times greater during the day due to lower humidity, increased temperatures, and increased wind speeds.

At night the land cools, creating air currents that travel downhill.

Wildfires are fanned by these winds and often follow the air currents over hills and through valleys. In extreme heat and dryness caused massive wildfires in Siberia , Alaska Canary Islands. In the Amazon rainforest The fires were caused mainly by illegal logging. The smoke from the fires expanded on huge territory including major cities. Scientists warn that if it continue like this, it can lead to disaster.

Wildfire's occurrence throughout the history of terrestrial life invites conjecture that fire must have had pronounced evolutionary effects on most ecosystems' flora and fauna. Fire helps to return nutrients from plant matter back to soil, the heat from fire is necessary to the germination of certain types of seeds, and the snags dead trees and early successional forests created by high-severity fire create habitat conditions that are beneficial to wildlife.

Although some ecosystems rely on naturally occurring fires to regulate growth, some ecosystems suffer from too much fire, such as the chaparral in southern California and lower-elevation deserts in the American Southwest. The increased fire frequency in these ordinarily fire-dependent areas has upset natural cycles, damaged native plant communities, and encouraged the growth of non-native weeds.

Because they are highly flammable, they can increase the future risk of fire, creating a positive feedback loop that increases fire frequency and further alters native vegetation communities. In the Amazon Rainforest , drought, logging, cattle ranching practices, and slash-and-burn agriculture damage fire-resistant forests and promote the growth of flammable brush, creating a cycle that encourages more burning. In tundra there is a natural pattern of accumulation of fuel and wildfire which varies depending on the nature of vegetation and terrain.


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Research in Alaska has shown fire-event return intervals, FRIs that typically vary from to years with dryer lowland areas burning more frequently than wetter upland areas. Plants in wildfire-prone ecosystems often survive through adaptations to their local fire regime. Such adaptations include physical protection against heat, increased growth after a fire event, and flammable materials that encourage fire and may eliminate competition.

For example, plants of the genus Eucalyptus contain flammable oils that encourage fire and hard sclerophyll leaves to resist heat and drought, ensuring their dominance over less fire-tolerant species. Smoke, charred wood, and heat can stimulate the germination of seeds in a process called serotiny. Grasslands in Western Sabah , Malaysian pine forests, and Indonesian Casuarina forests are believed to have resulted from previous periods of fire. An optimum fire frequency for growth is every 3 to 10 years. Too frequent fires favor herbaceous plants , and infrequent fires favor species typical of Bahamian dry forests.

The vertical lift of a severe thunderstorm or pyrocumulonimbus can be enhanced in the area of a large wildfire, which can propel smoke, soot, and other particulate matter as high as the lower stratosphere. Wildfires can affect local atmospheric pollution, [] and release carbon in the form of carbon dioxide. Low atmospheric oxygen during the Middle and Late Devonian was accompanied by a decrease in charcoal abundance.

Wildfires during the Paleozoic and Mesozoic periods followed patterns similar to fires that occur in modern times. Surface fires driven by dry seasons [ clarification needed ] are evident in Devonian and Carboniferous progymnosperm forests.

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Lepidodendron forests dating to the Carboniferous period have charred peaks, evidence of crown fires. In Jurassic gymnosperm forests, there is evidence of high frequency, light surface fires. As these grasses shifted to more mesic habitats , their high flammability increased fire frequency, promoting grasslands over woodlands. The human use of fire for agricultural and hunting purposes during the Paleolithic and Mesolithic ages altered the preexisting landscapes and fire regimes. Woodlands were gradually replaced by smaller vegetation that facilitated travel, hunting, seed-gathering and planting.

However, while ancient Hebrew, Greek, and Roman writers were aware of fires, they were not very interested in the uncultivated lands where wildfires occurred. From the Middle ages , accounts were written of occupational burning as well as customs and laws that governed the use of fire.

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In Germany, regular burning was documented in in the Odenwald and in in the Black Forest. In Spain during the s, sheep husbandry was discouraged in certain provinces by Philip II due to the harmful effects of fires used in transhumance. Scottish botanist David Douglas noted the native use of fire for tobacco cultivation, to encourage deer into smaller areas for hunting purposes, and to improve foraging for honey and grasshoppers. Charcoal found in sedimentary deposits off the Pacific coast of Central America suggests that more burning occurred in the 50 years before the Spanish colonization of the Americas than after the colonization.

Wildfires typically occurred during periods of increased temperature and drought. An increase in fire-related debris flow in alluvial fans of northeastern Yellowstone National Park was linked to the period between AD and , coinciding with the Medieval Warm Period. Dendrochronological fire scar data and charcoal layer data in Finland suggests that, while many fires occurred during severe drought conditions, an increase in the number of fires during BC and AD can be attributed to human influence.

However, a period of increased fire frequency between and was suggested by charcoal data from North America and Asia, attributed to human population growth and influences such as land clearing practices. This period was followed by an overall decrease in burning in the 20th century, linked to the expansion of agriculture, increased livestock grazing, and fire prevention efforts. According to a paper published in Science , the number of natural and human-caused fires decreased by Researchers explain this a transition from nomadism to settled lifestyle and intensification of agriculture that lead to a drop in the use of fire for land clearing.

Increases of certain native tree species i. Some invasive species , moved in by humans i.

National Interagency Fire Center

Examples include species such as Eucalyptus in California [] [] and gamba grass in Australia. Wildfire prevention refers to the preemptive methods aimed at reducing the risk of fires as well as lessening its severity and spread. In , U. President Franklin D.

Roosevelt initiated a nationwide fire prevention campaign, highlighting the role of human carelessness in forest fires. Later posters of the program featured Uncle Sam , characters from the Disney movie Bambi , and the official mascot of the U. Forest Service , Smokey Bear. Alteration of fuels is commonly undertaken when attempting to affect future fire risk and behavior.

Controlled burns are fires ignited by government agencies under less dangerous weather conditions. Vegetation may be burned periodically to maintain high species diversity and frequent burning of surface fuels limits fuel accumulation. Wildfire itself is reportedly "the most effective treatment for reducing a fire's rate of spread, fireline intensity, flame length, and heat per unit of area" according to Jan van Wagtendonk, a biologist at the Yellowstone Field Station.

Building codes in fire-prone areas typically require that structures be built of flame-resistant materials and a defensible space be maintained by clearing flammable materials within a prescribed distance from the structure.


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Fast and effective detection is a key factor in wildfire fighting. However, information analysis and delivery was often delayed by limitations in communication technology. Early satellite-derived fire analyses were hand-drawn on maps at a remote site and sent via overnight mail to the fire manager. During the Yellowstone fires of , a data station was established in West Yellowstone , permitting the delivery of satellite-based fire information in approximately four hours. Currently, public hotlines, fire lookouts in towers, and ground and aerial patrols can be used as a means of early detection of forest fires.

However, accurate human observation may be limited by operator fatigue , time of day, time of year, and geographic location. Electronic systems have gained popularity in recent years as a possible resolution to human operator error. A government report on a recent trial of three automated camera fire detection systems in Australia did, however, conclude " These systems may be semi- or fully automated and employ systems based on the risk area and degree of human presence, as suggested by GIS data analyses.

An integrated approach of multiple systems can be used to merge satellite data, aerial imagery, and personnel position via Global Positioning System GPS into a collective whole for near-realtime use by wireless Incident Command Centers. A small, high risk area that features thick vegetation, a strong human presence, or is close to a critical urban area can be monitored using a local sensor network.

Detection systems may include wireless sensor networks that act as automated weather systems: detecting temperature, humidity, and smoke.

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Additional capabilities such as night vision , brightness detection, and color change detection may also be incorporated into sensor arrays. Satellite and aerial monitoring through the use of planes, helicopter, or UAVs can provide a wider view and may be sufficient to monitor very large, low risk areas. These more sophisticated systems employ GPS and aircraft-mounted infrared or high-resolution visible cameras to identify and target wildfires.

Cloud cover and image resolution may also limit the effectiveness of satellite imagery. In a new fire detection tool is in operation at the U. The high-resolution data is used with a computer model to predict how a fire will change direction based on weather and land conditions. Previous NASA satellite data products available since the early s observed fires at 3, foot 1 kilometer resolution. The data is one of the intelligence tools used by the USFS and Department of Interior agencies across the United States to guide resource allocation and strategic fire management decisions.

The enhanced VIIRS fire product enables detection every 12 hours or less of much smaller fires and provides more detail and consistent tracking of fire lines during long duration wildfires — capabilities critical for early warning systems and support of routine mapping of fire progression. The model uses data on weather conditions and the land surrounding an active fire to predict 12—18 hours in advance whether a blaze will shift direction.

The state of Colorado decided to incorporate the weather-fire model in its firefighting efforts beginning with the fire season. The demand for timely, high-quality fire information has increased in recent years. Wildfires in the United States burn an average of 7 million acres of land each year. Wildfire suppression depends on the technologies available in the area in which the wildfire occurs. In less developed nations the techniques used can be as simple as throwing sand or beating the fire with sticks or palm fronds. Silver iodide can be used to encourage snow fall, [] while fire retardants and water can be dropped onto fires by unmanned aerial vehicles , planes , and helicopters.

Wildfires in Canada and the US burn an average of 54, square kilometers 13,, acres per year. Above all, fighting wildfires can become deadly. A wildfire's burning front may also change direction unexpectedly and jump across fire breaks. Intense heat and smoke can lead to disorientation and loss of appreciation of the direction of the fire, which can make fires particularly dangerous.

For example, during the Mann Gulch fire in Montana , USA, thirteen smokejumpers died when they lost their communication links, became disoriented, and were overtaken by the fire. In California, the U. Wildland fire fighters face several life-threatening hazards including heat stress , fatigue , smoke and dust , as well as the risk of other injuries such as burns , cuts and scrapes , animal bites , and even rhabdomyolysis.