#Cleantech and #ClimateChange #Podcast – Interview
with Paul Hessburg, Research Landscape Ecologist Talking about the Fires in #Australia
Hessburg discusses benefits of fighting fires proactively vs. reactively
and how Indigenous cultures managed forest fires in the past
Point Roberts WA, Delta BC, January 22, 2020 –
Investorideas.com, a global news source and leading investor resource covering
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edition of the Cleantech and Climate Change Podcast, talking about today's problems and solutions for the future.
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Read this in full at https://www.investorideas.com/news/2020/cleantech-climatechange/01221Interview-PaulHessburg.asp
Transcript/overview
Today we are talking to Paul Hessburg, Research
Landscape Ecologist, USDA-Forest Service, Pacific Northwest Research Station,
Wenatchee, WA.
Dawn/Investorideas.com:
Paul, thanks for joining us [again] today. It was
September 2018 when we last spoke and we talked about the mega forest fires in
North America; California and here in Canada. Now we’re witnessing a new kind
of mega-fire in Australia, like nothing we have ever seen. Can you talk about
the scope of the fires in Australia in terms of land mass/acres versus what our
worst fires in North America have looked like?
Paul Hessburg:
Hello Dawn, thanks for having me on the podcast. It
is difficult to take stock of the wildfires in Australia due to their rapid
speed and the fires outstripping the available resources. The impacts are
difficult to fully comprehend until the smoke and dust settles. New information
to the outside world lags as the country is mobilized to protect people,
property, and wildlife.
Sources currently estimate that in Australia
hundreds of homes and more than 18 million acres have burned thus far. In the
worst megafire years in the US, more than 10 million acres have burned, and
thousands of houses have been consumed or damaged. But fires often number in
the 10s of thousands during a bad year. In Australia in 2019, far fewer fires
account for the acres burned. In recorded memory, this fire storm year in
Australia sets a record for them in acres burned, and in fire severity, and it
sets a record for most places on the Earth.
January and February are typically Australia’s
driest months. 2019 was the warmest and driest year on record in Australia with
temperatures exceeding 120 degrees F on individual days and averaging more than
107 degrees for days at a time.
Australia is currently feeling the impacts of one
of the strongest Indian Ocean Dipole events on record. When the Indian Ocean
Dipole is positive, the waters off Australia’s Northwest coast become cooler
than average, and this effect moves moisture away rather than towards
Australia, accounting for the current very hot and dry conditions. (See the
figure below.)
So, it’s ordinary for this to be a time of
wildfires in Australia and for it be the hot, dry time of year. But the current
climate warming trend is not normal, and it bodes poorly for Australia’s
future.
Dawn/Investorideas.com:
And following that-is there a different strategy
needed for fires of this size?
Paul Hessburg:
When you think of it, few cities, counties,
parishes or countries are designed to safely and rapidly stave off or mitigate
the effects of worst-case scenarios when it comes to mega-disturbances
(wildfires, floods, tsunamis, earthquakes and the like). We are playing catch
up over most of the planet right now as we become more aware of this fact.
As with the other natural disasters, pro-action,
prevention, and preparedness are keys to success. This is clear from the
research literature. Results thus far with reacting to disasters have been
poor, and costly in terms of impacts to human life, personal well-being,
property, and after disturbances -- post disturbance economies. In the case of
wildland fires, pro-action, prevention, and preparedness are the key as well.
Research to date as well as human experience points to this fact.
Dawn/Investorideas.com:
CNN reporting on the fires recently cited that Bill
Gammage, an emeritus professor at Australian National University who studies
Australian and Aboriginal history, stated that aborigines “can feel the grass
and know if it would burn well; they knew what types of fires to burn for what
types of land, how long to burn, and how frequently.”
Further, they suggest that “Aboriginal techniques
are based in part on fire prevention: ridding the land of fuel, like debris,
scrub, undergrowth and certain grasses. The fuel alights easily, which allows
for more intense flames that are harder to fight.”
“The Aboriginal people would set small-scale fires
that weren't too intense and clear the land of the extra debris. The smaller
intensity fires would lessen the impact on the insects and animals occupying
the land, too, as well as protect the trees and the canopy.”
Can you discuss something, we talked about this, (something
we talked about in our first interview) how controlled burns can be a
preventative tool.
Paul Hessburg:
We did discuss this earlier, Dawn. Proactive
burning was regularly practiced by Australian aboriginals during periods of
moderating weather to reduce fuels, and to break up fuel patterns on the
landscapes with barriers to severe fire flow in advance of the dry season.
In fact, research today shows that every native
aboriginal culture we know of throughout the world practiced proactive burning.
They harnessed the intentional use of fire to meet wildfire on an equal
footing. Rather than take fire as it comes, they proactively used fire to
diminish its most harmful effects on people and habitats, while deploying its
beneficial influences on fuels and habitats.
Dawn/Investorideas.com:
Since we last talked are you seeing more of this
being done?
Paul Hessburg:
Proactive or prescribed burning is not happening in
most places with an active fire regime at anywhere near the extent needed. This
is also clearly shown in the research literature. The contiguous US is ~2.4
billion acres in area. To resemble the amount of historical burning that
moderated wildfire severity, we would need to see at least 50 million acres
burned each year when you exclude large portions of the US that are developed
and urbanized. We have more tools that burning alone to get the job done, but
you get the picture. The contiguous land area of the continental 48 is like
that of Australia.
Dawn/Investorideas.com:
I read that since fires are a big part of the
history of Australia, (certain trees including the gum trees can recover and
grow back) but that is under normal conditions. What do you think the future of
forests look like there after this season?
Paul Hessburg:
Gum forests evolved with fire down through the
ages, and they have lots of apps for fire. Reports suggest that many burn days
have been unprecedented in their severity. After severe fires, gum or eucalyptus
forests often regenerate from seed or re-sprout from buried roots.
One main effect of severe fire years is that many
new forests are regenerated. That is good news for species that live in new
early seral forests, but it is bad news for species, plants or animals that
make their living in mid or late seral forests.
Where fires are moderate, gum trees often resprout
for roots or lignotubers and burned stems. Their seeds are encased in a woody
capsule, which makes them fairly fire resistant. Seeds are stimulated to
germinate by fire, much like our own ceanothus species.
Dawn/Investorideas.com:
Turning back to North America, can you talk about
your work since we last spoke and where are you seeing a more proactive vs.
reactive strategy being deployed?
Paul Hessburg:
Far too few acres are proactively burned both here
and abroad. Consequently, escaped severe wildfires are managing most of the
acres.
People don’t like smoke and there are a lot more
people nowadays. When there is smoke made by intentional prescribed burning,
folks make a loud fuss. Meanwhile, wildfire smoke gets a pass, and society is
not asking, “Could we reduce this wildfire smoke and severe fire effects if we
did more proactive burning?” Folks just want all smoke to go away.
In my lab, we are studying the factors that are
most influential in creating and maintaining more fire resilient and climate
adapted forests. Forested area has dramatically increased and so has its
density in western North America. Our modeling suggests that the forested area
and density of forests present at the time of Euro-American settlement will not
likely be obtainable under climate change. We have work to do.
Dawn/Investorideas.com:
Let’s re-touch on a very important topic we
discussed last time; the costs of being proactive versus reactive.
Paul Hessburg:
The costs of choosing reactive over proactive
methods are enormous. They can be counted in eliminated forest habitats,
forested areas that cannot be regenerated back to forest any time soon owing to
burn severity, lost mid and late seral habitats, high human health effects,
damage to property and ecosystems, and high postfire bills.
In the US, we often spend 5-6 billion a year
preparing for and fighting fires. The postfire costs can be 10s to 100s of
times that cost. Modern wildfires specialize in high severity. These are the
fires that can escape initial attack.
We have many options moving forward to reduce the
severity of many of the coming wildfires we will face. While a steadily warming
climate largely influences annual area burned, it is live and dead fuel
abundance and its availability to burn that drives the intensity of today’s
fires, especially as they affect tree mortality, human health effects, and
postfire expenses.
To reduce severity, it is critical to address the
fuels that have accumulated over the period of fire exclusion. There are
numerous methods that can be used:
·
Methods include
prescribed burning alone, prescribed burning after mechanical thinning,
mulching, and managed wildfire. The application is determined by the
conditions, and by the social license available within the local community.
·
Sometimes the
woody fuel accumulations are so great after a century of fire suppression and
fire exclusion that fire-alone treatments are impossible because fire behavior
will be extreme or unpredictable, even with prescribed burning. That is when
prior thinning is needed. If there is no commercial opportunity, thinning would
have to be subsidized or it is impractical.
·
In many cases,
after naturally occurring ignitions, under moderate fire weather, fire managers
can use these ignitions to burn up surface fuels and to thin out trees.
Maintenance treatments usually involve Rx burning.
·
Mulching
involves breaking up the shrub and understory fuels with a mechanical mulching
head and mixing those pieces in with the soil.
Dawn/Investorideas.com:
Our biggest fears are that the Australian fires
will trigger weather patterns that play out globally and escalate or accelerate
all the climate changes we are concerned with. Are you aware of anyone modeling
forest fires globally and creating predictive models, and if so, what are
you/they seeing?
Paul Hessburg:
Global climate change (GCMs) models are
increasingly incorporating the effects of modern-day wildfires and increasing
burned area on greenhouse gas (GHG) accumulation in the atmosphere, and the
redistribution of carbon by pool continentally and regionally. Likewise, some
individual nations are doing high quality knowledge discovery work to that end.
Wildfires are no longer being given a pass in live
forest carbon storage calculations, and some countries are beginning the work
of revising those calculations. The reasons are that wildfires are no longer a
background but a major landscape reshaping influence. Wildfires are burning
lots of new area in the US and Canada, for example. We have a new project with
a Canadian laboratory to do this work. The concerning detail now is that
wildfire emissions have surpassed total fossil fuel GHG emissions in several
recent years. It means that we may have significantly underestimated the
contribution of escalating GHG emissions from wildfires to global climate
change.
Dawn/Investorideas.com:
In closing, I ask again, what can we all do
personally so we don’t sit back helplessly and watch this?
Paul Hessburg:
Global climate change is ongoing and worsening and
we have an opportunity to reduce our personal and local community carbon
footprints. We also can support sound forest ecology and climate change
adaptation efforts on state and federal lands to reduce the rate and magnitude
of climate change in our country and world.
Climate change is a key. There many opportunities
for us as individuals to reduce our contribution to the problem. We can reduce
our Jet A footprint by flying less. For many of us, that is our primary
contribution to our personal carbon footprint. We can drive less, recycle and
reuse more, and drive smaller cars. We can walk more.
Thanks, that’s it for today. Do something good for this beautiful planet
each and every day.
Podcast host: Dawn Van Zant
If you would like to be a guest on this podcast and
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