The Star: July 13, 2023

The Star Thursday July 13 2023
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NEWS
Stolen dog
found after
road trip
A DOG TAKEN from a rescue shelter in
Woolston was found in Timaru.
Police were told last Thursday
night Buddy had been stolen from the
Christchurch Bull Breed Rescue facility.
But after “excellent CCTV footage” was
provided by the shelter, police identified a
suspect and vehicle of interest.
“After further inquiries and with
the assistance of Timaru District Council
animal officers, Buddy was found safe
and well following a search warrant in
Timaru,” a police spokesperson said.
A 47-year-old man has been charged
with burglary.
Latest Canterbury ne
SAFE AND SOUND: Constable Jack
Phillips with Buddy who was found
after a search warrant was executed
in Timaru.
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Scientist’s warning
about paper-based
disposable cutlery
WOOD AND PAPER-based disposable
cutlery is seen as a greener option than
plastic – but a Canterbury University
academic is warning it could actually be
more of a threat when it comes to climate
change.
Senior lecturer in chemical
and process engineering Dr
Heon Park said petroleumbased
plastic is a long-term
problem for the oceans and
takes hundreds of years to
break down, but wooden cutlery
and tableware, made from
bamboo, birch or paper, has a
higher carbon footprint.
“If we are worried about
climate change and our carbon
footprint, then we need to stop
using wooden and paper-based
disposable cutlery and food
containers,” he said.
“These products release more carbon
dioxide into the air when they are being
produced and even as they degrade, and
the increasing level of carbon dioxide in
our atmosphere is the main trigger for the
warming climate.”
Park said biodegradable plastic
is a better option because it has a
lower carbon footprint than wooden
or paper disposable cutlery and
degrades more quickly than
conventional plastics.
But biodegradable
plastic (recycling code
7) shouldn’t be recycled
because the materials are
designed to break down
easily and are too fragile to
reuse safely.
“If biodegradable plastics can
be recycled in an eco-friendly
way for uses that don’t require
strength, then they
could become
the
material of the future,” Park said. “That’s
the direction I think we need to take.”
One of the downsides of biodegradable
plastic is its breakdown is either too slow
or not controlled. Park is investigating
using additives to accelerate this
degradation.
One potential additive he
has been testing is powdered
pounamu, a waste product
from the jewellery carving and
craft industry. Park said early
results using pounamu from
a West Coast supplier show
when a small amount of powder
is added to biodegradable
PLA (polylactic acid) plastic,
it enhances strength, reduces
flammability, and accelerates
Heon Park degradation
“We think this additive could
be added to biodegradable plastic and
used to make milk crates, making them
stronger for carrying cartons of milk.
“If they are lost in the environment,
they would break down in a shorter
timeframe than conventional plastic
products,” Park said.