Showing posts with label global warming. Show all posts
Showing posts with label global warming. Show all posts

Tuesday, August 20, 2019

Can environmental populism save the planet? It is difficult, but possible

Current Affairs

Populism and environmentalism are words seldom seen in the same sentence. One is associated predominantly with nationalists and charismatic leaders of “real people”, the other with broadly-based collective action to address the world’s single most pressing problem.
Differences don’t get much starker, it would seem. But we are increasingly seeing the two strands combine in countries around the world.Exhibit A in support of this thesis is the remarkable growth and impact of Extinction Rebellion, often known as XR.
When I finished writing a book on the possibility of environmental populism little more than six months ago, I’d never even heard of XR. Now it is a global phenomenon, beginning to be taken seriously by policymakers in some of the world’s more consequential democracies. Britain’s decision earlier this year to declare a climate emergency is attributed in part to 11 days of Extinction Rebellion protest that paralysed parts of London.
Greta Thunberg, the remarkable Swedish schoolgirl who has rapidly become one of the world’s leading climate activists, is another – rather inspiring – example of a rising tide of popular opinion demanding political leaders take action before it is too late. It is also a telling indictment of the quality and imagination of the current crop of international leaders that schoolchildren are taking the lead on an issue that will, for better or worse, define their future.

 It is striking that so many prominent figures in international politics are not just buffoonish, self-obsessed and ludicrously underqualified for the positions they hold, but are also rather old.I speak as an ageing baby boomer myself, and a childless one at that. My rather ageist point is that I simply don’t have the same stake in the future that young people do, who have perhaps 70 or 80 years yet to live...Read More

Thursday, May 30, 2019

Climate change is causing mass 'die-offs' in seabirds such as puffins

International News

Changes in seabird numbers are probably the best way to monitor the quality of the marine environment. And things are looking bad. In the past 50 years, the world population of marine birds has more than halved. What’s worse is that few people have noticed.
Puffins, guillemots, penguins and albatrosses are all in decline. How do we know this? There are three main ways of checking on numbers. First and best are long-term population studies: counts of individuals or pairs at their breeding colonies made in a systematic, rigorous way each year at established “study plots”. For instance, I have studied the same population of guillemots on Skomer Island in Wales since 1972. Consistent, careful methodology is the key here, but it is labour intensive.
Second, are one-off counts made every ten years or so over larger areas. This has occurred in the UK, starting with the census known as “Operation Seafarer” in 1969-70, and with the most recent survey last year. This method provides estimates of the size of the overall population of different species but is less good at detecting small changes in numbers.
The third way is by counting the bodies of seabirds washed up on the shoreline – usually referred to as beached bird surveys. Regular, systematic counts along set lengths of shoreline provide background levels of mortality. Occasionally, numbers spike in what in seabird parlance is known as a “wreck”, as occurred in 2014 when more than 50,000 seabirds, mainly guillemots and puffins, were washed up on the west coast of Britain and France.
Seabird wrecks have been known about for a long time, but they are becoming more common. Wrecked seabirds are usually emaciated,

 having usually starved to death, indicating a catastrophic failure in their food supply.

Thursday, February 7, 2019

Melting ice sheets may cause 'climate chaos' in a few decades: Study

Current Affairs:

Billions of tonnes of meltwater flowing into the world's oceans from the Greenland and Antarctic ice sheets could boost extreme weather and destabilise regional climate within a matter of decades, researchers said Wednesday.

These melting giants, especially the one atop Greenland, are poised to further weaken the ocean currents that move cold water south along the Atlantic Ocean floor while pushing tropical waters northward closer to the surface, they reported in the journal Nature.
Known as the Atlantic Meridional Overturning Circulation (AMOC), this liquid conveyor belt plays a crucial role in Earth's climate system and helps ensures the relative warmth of the Northern Hemisphere.

"According to our models, this meltwater will cause significant disruptions to ocean currents and change levels of warming around the world," said lead author Nicholas Golledge, an associate professor at the Antarctic Research Centre of New Zealand's Victoria University of Wellington.
The Antarctic ice sheet's loss of mass, meanwhile, traps warmer water below the surface, eroding glaciers from underneath in a vicious circle of accelerated melting that contributes to sea level rise.


 Most studies on ice sheets have focused on how quickly they might shrink due to global warming, and how much global temperatures can rise before their disintegration -- whether over centuries or millenia -- becomes inevitable, a threshold known as a "tipping point."