Seaweed, or macroalgae, refers to several species of
macroscopic, multicellular, marine algae. Seaweed species such as kelps provide
essential nursery habitat for fisheries and other marine species and thus
protect food sources; other species, such as planktonic algae, play a vital
role in capturing carbon, producing up to 90 percent of earth's oxygen. Seaweed
are a source of biologically active compounds including proteins and
polysaccharides with promising uses in nutrition, biomedicine, bioremediation
and other uses. ~ have you ever seen or
read about them ? – can you identify this packet ?
Globally, Water crisis and plastic avoidance are at the top of
the issues concerning people. Chennai is
reeling under heat and is also facing acute water crisis. Rivers, tanks, wells, borewells at places have gone dry and so many
water tankers and people running after tankers with plastic pots are becoming a
common sight. There are fears that the
major reservoirs and river basins has fallen to 21% of its average for the last
10 years, pushing thousands of villages across the nation to a possible water
crisis.
The
CWC data also shows that, except the Indus, the Narmada, and the west-bound
rivers of the south, the water level in all the river basins is less than the
average of the last 10 years — the worst affected are Kutch, Tapi and Sabarmati
in Gujarat; Godavari, Krishna and Cauvery in southern India, and the Mahanadi
from Chhattisgarh to Odisha in eastern India.
Back
home, one still find plastics after the ban by the State. Some small scale vendors and shops have been
worst sufferers – for example, those selling idly batter, edibles and
side-dishes like chutney, tomato puree have to find alternatives for the
plastic packs they used and find that the cost of packing has risen
exorbitantly. Meantime, one also finds
MNC brand chips, biscuits and the like still hanging on every shop – and they
too are made of plastic only ! The
thrust is on single-use plastic of bi0-degradables. From a purely commercial standpoint,
single-use plastics, or SUPs, are a blockbuster innovation. Food container
manufacturers have responded by making them even thinner and cheaper, which
causes more single usage in a vicious cycle – but, are they really degradable,
meaning would they vanish in thin air ?
In an interesting post in National Geographic, a British marine biologist who devoted his
career to studying plastic waste, analysed whether biodegradable shopping bags actually degrade. In 2015, he and his graduate students at
Plymouth University buried a collection of bags labelled as biodegradable in
the school’s garden.Three years later, when the bags were dug up, the bags not
only had remained intact, they still could carry almost five pounds of
groceries. They did not have the same
strength as they had when new, but had not degraded to any meaningful extent. The
indestructible qualities of biodegradable bags are just one of the findings in
a first-of-its-kind study published in the journal Environmental Science &
Technology. The research documents deterioration of five types of shopping bags
that were immersed in water, buried in soil, or exposed to outdoor air as if
litter.
The study highlights how the term “biodegradable” is often
misunderstood by commoners like us – we think that the bag will simply disappear if thrown away. Scientists warn that chemical additives in
biodegradable bags can contaminate the mixture, rendering it unusable. Now read
this interesting news item from MailOnline on the effort to cut plastic ! .. ..
it reads that London Marathon runners were offered energy
drinks in seaweed capsules in bid to cut 650,000 plastic bottles used in race !
Thousands
of seaweed capsules filled with energy drink were handed out to competitors at
the London Marathon as part of efforts to reduce the vast amount of plastic
used at the event.Around 650,000 plastic bottles were provided at last year's
marathon and, while they were recyclable, their use was branded a 'waste of
resources'.However this time organisers were seen trialling a range of
innovations and measures aimed at cutting plastic use and reducing waste at
this year's marathon.The event saw the largest ever trial of Ooho seaweed
edible and biodegradable capsules, more than 30,000 of which were handed out at
the 23rd mile of the iconic marathon.
The
Ooho seaweed edible and biodegradable capsules are made from brown seaweed,
which inventors say is one of nature's most renewable resources.Elsewhere on
the route, three Lucozade Sport stations used compostable cups rather than
bottles.Organisers said they aim to cut the number of plastic bottles on the
course by more than 215,000 at this year's event.Following the 2018 marathon,
Tory MP Pauline Latham criticised the sight of discarded bottles 'dozens deep
along the streets'. She told the Commons: 'We need to keep people like that
hydrated, but actually using single use plastics is such a waste of resources
and there should be better ways.'
As
well as efforts to cut the number of bottles in use, organisers are testing
ways of recycling them more effectively.Using a 'closed loop' system, plastic
bottles collected in Tower Hamlets, Greenwich, Southwark and Canary Wharf will
be returned directly to a reprocessing plant where they will be recycled into
new bottles.
Interesting
!
With
regards – S. Sampathkumar