Latest estimates warn that many coastal cities, towns, villages and resorts in mainland Portugal are likely to become increasingly vulnerable to flooding or total destruction by sea levels that are rising far faster than expected.
The latest evaluation of data on rising sea
levels has tripled previous estimates of vulnerability in coastal areas around the
world.
An
analysis published by the international scientific journal Nature Communications predicts that the lives of hundreds of
millions of people in low-lying coastal areas could be drastically affected if
greenhouse gas emissions are not radically curtailed to prevent global warming increasing
to an unmanageable height by 2050.
Even
though scientific information is not always correct and remains open to review
based on new hard evidence, the latest sea-level predictions are alarming.
They indicate that up to 340 million people are currently living on land below projected
flood levels for 2050, and that by the end of the century the number will have reached 630 million.
It’s being emphasised that translating sea-level
projections into potential exposure of populations is critical for coastal
planning and for assessing the costs of failure to act.
Scientists say that the rate of
sea-level rise has accelerated year after year since the mid-1960s when parts
of the world’s oceans began to expand, particularly in the Southern Hemisphere,
because of saltwater absorbing more heat.
The average sea-level rise has
quickened since the mid-1990s, particularly in the last two decades, probably due
to ever-faster ice loss in Greenland and Antarctica.
Another study, conducted by University of Lisbon
researchers, has noted that hundreds of thousands of people living in
coastal areas in mainland Portugal are involved in all sorts of high
economic activities, and that a great
many infrastructures will have to be
adapted and protected from extreme storms as well as natural sea level rise.
To develop climate change
adaptation strategies, say the authors of the study, a reliable and accurate
assessment of the physical vulnerability to rising sea levels is crucial.
In line with a
European Union directive, potential hazards along the coast of mainland
Portugal have been evaluated for the years 2025, 2050, and 2100, taking into
consideration different sea level scenarios.
The
overwhelming scientific evidence seems clear: humanity and many other forms of
life on our planet are facing devastation, if not eventual extinction, unless
greenhouse gas emissions are severely limited – and soon.
The
climate of the world has been changing since the beginning of time, but the
global warming that has been intensifying in recent decades is believed to be
unprecedented and the cause not only of rising sea levels and flooding, but of
extreme conditions such as ruinous wildfires,
storms, heatwaves and droughts.
Overall,
the situation is becoming increasingly complex involving a range of difficult
issues for individual countries, including endangered island nations.
Apart
from enlightening research work, remarkably little has been achieved since the
historic Paris Agreement signed in 2016 to prevent the looming crisis.
The lengthy
COP 25 event in Madrid that concluded at the end of last week having achieved
little, was the 25th annual climate change conference organised by
the United Nations. Substantial disagreements on curbing greenhouse gases
remain and it was left to an outspoken sixteen-year-old to denounce pledges by
leading political and business leaders as hollow, deceptive and based on
“clever accounting and creative PR”.
At least UN Secretary-General and former
Portuguese Prime Minister António Guterres seemed to be in harmony with Greta
Thunberg and millions of protesting schoolchildren around the world when he
told the Madrid conference that the planet is close to “the point of no
return”.
Agreement
on fully cooperative action, especially among the wealthiest and biggest
polluting nations, is expected to be crucial at COP 26, which will be held in November
2020 in Glasgow.