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Forest fires: the good and the bad
Every year it seems like there’s another disastrous wildfire in the American West. In 2018, nearly 9 million
acres were burned in the US alone. Uncontrolled fires often started accidentally by people, rampage and
decimate forests.
F
or most people, a forest fire is synonymous with disaster. But there are some kinds of forest fires that
actually benefit the environment.
A controlled burn is a wildfire that people set intentionally for a specific purpose. Well-thought-out and wellmanaged controlled burns can be incredibly beneficial for forest management—in part because they can help stop
an out-of-control wildfire. The technique is called backburning, and it involves setting a controlled fire in the path
of the approaching wildfire. All the flammable material is burnt up and extinguished. When the wildfire
approaches, there’s no more fuel left for it to keep going, and it dies out.
Controlled burns are also used to prevent forest fires. Even before human involvement, natural, low-intensity
wildfires occurred every few years to burn up fuel, plant debris, and dead trees, making way for young, healthy
trees and vegetation to thrive. That new growth in turn supports forest wildlife. Forest managers are now
replicating this natural strategy when appropriate, starting manageable, slow-burning fires to make room for new
life that will help keep the forest healthy in the long term.
The same method is one of WWF’s strategies for maintaining grassland habitats in the Northern Great
Plains. Working with partners such as the U.S. Fish and Wildlife Service, WWF has intentionally burned hundreds
of acres of prairie land to revitalize these key habitats. The fire burns off tall, aggressive vegetation that isn’t as
hospitable to wildlife, and makes room for new growth that attracts bison, birds, and prairie dogs.
This doesn’t mean all intentional wildfires are good – far from it. Many of the fires intentionally set for
agriculture and land clearing are at best ill-advised, and at worst devastating. Slash and burn fires are set every
day to destroy large sections of forests. Of course, these forests don’t just remove trees; they kill and displace
wildlife, alter water cycles and soil fertility, and endanger the lives and livelihoods of local communities. They also
can rage out of control. In 1997, fires set intentionally to clear forests in Indonesia escalated into one of the largest
wildfires in recorded history. Hundreds of people died; millions of acres burned; already at-risk species like
orangutans perished by the hundreds; and a smoke and ash haze hung over southeast Asia for months, reducing
visibility and causing acute health conditions.
That’s exactly why WWF helps governments around the world crack down on slash and burn deforestation.
WWF also works with farmers and companies to stop unnecessary agricultural burns. And when our scientists
think fire could be the best solution for revitalizing wild areas, we bring the right experts to the table to study the
situation and come up with a plan.
All fire is risky. To minimize that risk as much as possible, controlled burns must be well-considered, wellplanned, and ignited and maintained by trained professionals. The bottom line? Fire can be a tool for
conservation, but only when used the right way.
Disponível em: https://www.worldwildlife.org/stories/forest-fires-the-good-and-the-bad. Acesso em: 08 out. 2019
De acordo com o texto, em termos de sentido, verifica se que
Partindo do princípio de que as competições tenham início às 7 horas e desconsiderando as possíveis mudanças de horário em função do estabelecimento do horário de verão, julgue a validade das afirmativas relativas às diferenças entre o horário da sede do evento (que está no mesmo fuso horário de Brasília) e o horário de algumas das cidades do mundo. 
