Chuyên mục: Biến đổi khí hậu – Climate change

For 110 years, climate change has been in the news. Are we finally ready to listen?

~ Đào Thu Hằng ~ Bình luận về bài viết này

theconversation.com

On August 14 1912, a small New Zealand newspaper published a short article announcing global coal usage was affecting our planet’s temperature.

This piece from 110 years ago is now famous, shared across the internet this time every year as one of the first pieces of climate science in the media (even though it was actually a reprint of a piece published in a New South Wales mining journal a month earlier).

So how did it come about? And why has it taken so long for the warnings in the article to be heard – and acted on?

Short newspaper article with the headline
This short 1912 article made the direct link between burning coal and global temperature changes. The Braidwood Dispatch and Mining Journal, National Library of Australia

The fundamental science has been understood for a long time

American scientist and women’s rights campaigner Eunice Foote is now widely credited as being the first person to demonstrate the greenhouse effect back in 1856, several years before United Kingdom researcher John Tyndall published similar results.

Her rudimentary experiments showed carbon dioxide and water vapour can absorb heat, which, scaled up, can affect the temperature of the earth. We’ve therefore known about the relationship between greenhouse gases and Earth’s temperature for at least 150 years.

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What The Ozone Layer Teaches Us About Climate Action

~ Đào Thu Hằng ~ Bình luận về bài viết này

06 APR, 2021

when it comes to the Paris Agreement and climate action; namely that when individuals change their behaviour by consuming differently they can drive industries to change, as those industries are then caught between a ‘greening’ consumer demand and international and governmental policies focusing on climate action. 

UNFCCC

Credit: NOAA / Unsplash

Back in the 1980s, everyone was talking about the hole in the ozone layer, so what happened, and what can the international agreement to ban CFCs teach us about the importance of multilateral cooperation when it comes to climate action?

What exactly is the ozone layer?

The ozone layer is the part of the Earth’s atmosphere that protects the planet from ultraviolet radiation. It’s found in the Stratosphere which is around 10-50km above the surface of the earth. Think of it as a layer of sunscreen that protects us from all manner of harmful rays. Without it, life on Earth would be extremely unpleasant.

So, I’m guessing a hole in it is not a good thing

Exactly right, in fact it’s a very bad thing.

So what caused it?

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Arctic is warming nearly four times faster than the rest of the world

~ Đào Thu Hằng ~ Bình luận về bài viết này

theconversation.com

The Earth is approximately 1.1℃ warmer than it was at the start of the industrial revolution. That warming has not been uniform, with some regions warming at a far greater pace. One such region is the Arctic.

A new study shows that the Arctic has warmed nearly four times faster than the rest of the world over the past 43 years. This means the Arctic is on average around 3℃ warmer than it was in 1980.

This is alarming, because the Arctic contains sensitive and delicately balanced climate components that, if pushed too hard, will respond with global consequences.

Why is the Arctic warming so much faster?

A large part of the explanation relates to sea ice. This is a thin layer (typically one metre to five metres thick) of sea water that freezes in winter and partially melts in the summer.

The sea ice is covered in a bright layer of snow which reflects around 85% of incoming solar radiation back out to space. The opposite occurs in the open ocean. As the darkest natural surface on the planet, the ocean absorbs 90% of solar radiation.

When covered with sea ice, the Arctic Ocean acts like a large reflective blanket, reducing the absorption of solar radiation. As the sea ice melts, absorption rates increase, resulting in a positive feedback loop where the rapid pace of ocean warming further amplifies sea ice melt, contributing to even faster ocean warming.

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58% of human infectious diseases can be worsened by climate change – we scoured 77,000 studies to map the pathways

~ Đào Thu Hằng ~ Bình luận về bài viết này

theconversation.com

Published: August 8, 2022 4.00pm BST

Climate change can exacerbate a full 58% of the infectious diseases that humans come in contact with worldwide, from common waterborne viruses to deadly diseases like plague, our new research shows

Our team of environment and health scientists reviewed decades of scientific papers on all known pathogenic disease pathogens to create a map of the human risks aggravated by climate-related hazards.

The numbers were jarring. Of 375 human diseases, we found that 218 of them, well over half, can be affected by climate change.

Flooding, for example, can spread hepatitis. Rising temperatures can expand the life of mosquitoes carrying malaria. Droughts can bring rodents infected with hantavirus into communities as they search for food.

With climate change influencing more than 1,000 transmission pathways like those and climate hazards increasingly globally, we concluded that expecting societies to successfully adapt to all of them isn’t a realistic option. The world will need to reduce the greenhouse gas emissions that are driving climate change to reduce these risks.

Khủng hoảng khí hậu: Chuyện tiền cả đấy!

~ Phạm Thu Hương ~ Bình luận về bài viết này

LÊ QUANG 31/07/2022 06:33 GMT+7

TTCT – Khi người tiêu dùng rên xiết bởi đồng tiền mất giá, lãi bán hàng không đủ mua xăng dầu, hay mùa đông tới châu Âu có lẽ phải hạ lò sưởi xuống 18 độ C – thì chiến sự ở Ukraine là lời giải thích quá vội vã và quá dễ dãi. Về lâu dài, biến đổi khí hậu mới là nguyên nhân chính.

Khủng hoảng khí hậu: Chuyện tiền cả đấy! - Ảnh 1.

Nhiều nước châu Âu đang trải qua giai đoạn nắng nóng kỷ lục. Ảnh: Reuters

Các nghiên cứu trước đây đã chỉ ra mối liên hệ giữa thời tiết khắc nghiệt và khủng hoảng kinh tế, nhưng chỉ tập trung vào các nước đang phát triển, tình cờ cũng là những quốc gia bị lũ lụt, bão và hạn hán thường xuyên và nghiêm trọng hơn nhiều so với phương Tây. Nói cách khác, người ta đã cố tình lờ đi một điểm yếu của phương Tây, vốn vẫn luôn bị ảnh hưởng bởi biến đổi khí hậu, nay chỉ lộ rõ hơn vì chiến sự Ukraine.

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Human disruption to Earth’s freshwater cycle has exceeded the safe limit 

~ Đào Thu Hằng ~ Bình luận về bài viết này

theconversation.com

Green water – the rainwater available to plants in the soil – is indispensable for life on and below the land. But in a new study, we found that widespread pressure on this resource has crossed a critical limit.

The planetary boundaries framework – a concept that scientists first discussed in 2009 – identified nine processes that have remained remarkably steady in the Earth system over the last 11,700 years. These include a relatively stable global climate and an intact biosphere that have allowed civilisations based on agriculture to thrive. Researchers proposed that each of these processes has a boundary that, once crossed, puts the Earth system, or substantial components of it, at risk of upset.

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Slow water: can we tame urban floods by going with the flow?

~ Phạm Thu Hương ~ Bình luận về bài viết này

As we face increased flooding, China’s sponge cities are taking a new course. But can they steer the country away from concrete megadams?

Written by Erica Gies, read by Andrew McGregor and produced by Tony Onuchukwu. The executive producers were Max Sanderson and Isabelle Roughol.

the guardian – Fri 17 Jun 2022 05.00 BST

  • Read the text version here
  • Listen here
WEIHUI, CHINA - JULY 26: Aerial view of rescue team using inflatable rafts evacuate residents from flooded area after heavy downpour, on July 26, 2021 in Weihui, Xinjiang City, Henan Province of China.
 Photograph: China News Service/Getty Images

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Country Climate and Development Report for Vietnam

~ Đào Thu Hằng ~ Bình luận về bài viết này

worldbank.org

Vietnam CCDR Report

Vietnam is increasingly seeing its development affected by climate change and now faces critical questions about how to respond. The Vietnam Country Climate and Development Report proposes that Vietnam shift its development paradigm by incorporating two critical pathways – resilient pathway and decarbonizing pathway – that will help the country balance its development goals with increasing climate risks.

After more than two decades of steady growth, Vietnam has set an ambitious goal of reaching high-income status by 2045. It has been recognized in the 2021-2030 Socioeconomic Development Strategy that the country’s economic transformation will greatly depend on better management of natural capital – the extensive stocks of agricultural, forest, and mineral resources that have helped drive development.

Yet Vietnam, with over 3,200 km of coastline and many low-lying cities and river delta regions, is one of the most vulnerable countries in the world to climate change. Climate change impacts  – mainly higher and more variable temperatures and sea level rise  – are already disrupting economic activity and undermining growth. Initial calculations suggest that Vietnam lost $10 billion in 2020, or 3.2 percent of GDP, to climate change impacts.

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Singapore’s dengue ’emergency’ is a climate change omen for the world

~ Trần Đình Hoành ~ Bình luận về bài viết này

By Heather Chen, CNN

Updated 0213 GMT (1013 HKT) June 7, 2022

A worker fogs a housing estate for mosquitoes in Singapore on August 27, 2020.

A worker fogs a housing estate for mosquitoes in Singapore on August 27, 2020.

(CNN)Singapore says it is facing a dengue “emergency” as it grapples with an outbreak of the seasonal disease that has come unusually early this year.

The Southeast Asian city-state has already exceeded 11,000 cases — far beyond the 5,258 it reported throughout 2021 — and that was before June 1, when its peak dengue season traditionally begins.

Experts are warning that it’s a grim figure not only for Singapore — whose tropical climate is a natural breeding ground for the Aedes mosquitoes that carry the virus — but also for the rest of the world. That’s because changes in the global climate mean such outbreaks are likely to become more common and widespread in the coming years.

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Climate Change made devastating early heat in India and Pakistan 30 times more likely

~ Đào Thu Hằng ~ Bình luận về bài viết này

“The 2022 heat wave in India and Pakistan is an extreme weather event which has resulted in the hottest March in India since 1901. The hot season arrived unusually early in the year and extended into April, affecting a large part of India’s northwest and Pakistan”. Wikipedia

worldweatherattribution.org

Since the beginning of March, India and Pakistan and large parts of South Asia experienced prolonged heat, that at the time of writing, May 2022, still hasn’t subsided.

March was the hottest in India since records began 122 years ago and in Pakistan, the highest worldwide positive temperature anomaly during March was recorded and many individual weather stations recorded monthly all-time highs through March. At the same time, March was extremely dry, with 62 percent less than normal rainfall reported over Pakistan and 71 percent below normal over India, making the conditions favourable for local heating from the land surface. The heatwave continued over the month of April and reached its preliminary peak towards the end of the month. By the 29th of April, 70 percent of India was affected by the heatwave.

While heatwaves are not uncommon in the season preceding the monsoon, the very high temperatures so early in the year coupled with much less than average rain have led to extreme heat conditions with devastating consequences for public health and agriculture. The full health and economic fallout, and cascading effects from the current heat wave will however take months to determine, including the number of excess deaths, hospitalisations, lost wages, missed school days, and diminished working hours. Early reports indicate 90 deaths in India and Pakistan, and an estimated 10-35 percent reduction in crop yields in Haryana, Uttar Pradesh, and Punjab due to the heatwave.

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As biomass burning surges in Japan and South Korea, where will Asia get its wood?

~ Đào Thu Hằng ~ Bình luận về bài viết này

by Annelise Giseburt on 19 May 2022

news.mongabay.com

  • In 2021, Japan and South Korea imported a combined 6 million metric tons of wood pellets for what proponents claim is carbon-neutral energy.
  • Large subsidies for biomass have led Japan to import massive amounts of wood pellets from Vietnam and Canada; two pellet giants, Drax and Enviva, are now eyeing Japan for growth, even as the country may be cooling to the industry.
  • South Korea imports most of its pellets from Vietnamese acacia plantations, which environmentalists fear may eventually pressure natural forests; South Korea wants to grow its native production tenfold, including logging areas with high conservation value.
  • Vietnam may soon follow Japan and South Korea’s path as it phases out coal, and experts fear all this could add massive pressure on Southeast Asian forests, which are already among the most endangered in the world.

This is part two of a two part series on the Asian biomass expansion. Part one can be found here.

Under the guise of “carbon neutral” energy, Japan and South Korea’s appetite for woody biomass for electricity generation has increased exponentially over the past decade and continues to grow. The two nations’ biomass subsidies are spurring an increase in the production of wood for burning in Southeast Asia and North America, putting pressure on forests in those regions.

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Mô thức nuôi tôm mới: Kỳ vọng phá vỡ giới hạn của ngành tôm

~ Đào Thu Hằng ~ Bình luận về bài viết này

khoahocphattrien.vn

Giữa vùng ĐBSCL tưởng như đã có rất nhiều các giải pháp nông nghiệp thì tinh thần “làm đúng lại cái đang bị làm sai; làm tốt hơn cái đang tốt; làm có cái chưa có; và làm một dấu ấn tốt để lại cho cuộc sống” của TS. Nguyễn Thanh Mỹ vẫn thôi thúc ông đi tìm giải pháp giúp ngành tôm vượt qua những thách thức đang bó buộc tiềm năng của lĩnh vực này.

Giải pháp mà TS. Nguyễn Thanh Mỹ – Giám đốc điều hành Rynan Technologies và Mỹ Lan Group hướng đến ấy là một cách thức thực hành khác với những gì đã có từ trước đến nay – một “mô thức” nuôi tôm thẻ siêu thâm canh giàu oxy công nghệ số TOMGOXY (viết tắt cho chữ Tôm Giàu Oxy) mà ông và các kỹ sư ở công ty đã phát triển, dựa trên sự tích hợp các công nghệ vật lý, hóa học, sinh học và kỹ thuật số.

Tại sao cần mô thức mới?

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Công bố Báo cáo triển vọng năng lượng Việt Nam 2021 – Đan Mạch khuyến nghị 

~ Đào Thu Hằng ~ Bình luận về bài viết này

nangluongvietnam.vn

15:09 | 02/06/2022

 – Ngày 2/6/2022, tại Hà Nội, Bộ Công Thương phối hợp với Đại sứ quán Đan Mạch tổ chức Lễ ra mắt Báo cáo triển vọng năng lượng Việt Nam 2021. Thứ trưởng Bộ Công Thương ông Đặng Hoàng An và Đại sứ Đan Mạch tại Việt Nam ông Kim Højlund Christensen đồng chủ trì sự kiện.

8 phát hiện và khuyến nghị chính của Báo cáo Triển vọng năng lượng Việt Nam 2021:

1. Hoàn toàn khả thi để phát triển một hệ thống năng lượng có mức phát thải ròng bằng không với chi phí tăng thêm chỉ 10% so với kịch bản cơ sở nếu thực hiện đúng cách.

2. Để đạt được mức phát thải ròng bằng không vào năm 2050 với chi phí thấp nhất, các nguồn năng lượng tái tạo cần là nguồn thay thế chính cho nhiên liệu hoá thạch. Hệ thống điện cần đáp ứng 70% nhu cầu năng lượng vào năm 2050. Các nguồn năng lượng tái tạo chính là điện mặt trời (75%) và điện gió (21%).

3. Quá trình chuyển đổi xanh của hệ thống điện cần nhiều vốn, tương đương mức đầu tư 167 tỷ USD/năm vào năm 2050 với kịch bản net-zero, tức là khoảng 11% GDP dự kiến năm 2050. Do đó việc tiếp cận các giải pháp tài chính chi phí thấp là tối cần thiết.

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How treaties protecting fossil fuel investors could jeopardize global efforts to save the climate – and cost countries billions

~ Đào Thu Hằng ~ Bình luận về bài viết này

theconversation.com

Fossil fuel companies have access to an obscure legal tool that could jeopardize worldwide efforts to protect the climate, and they’re starting to use it. The result could cost countries that press ahead with those efforts billions of dollars.

Over the past 50 years, countries have signed thousands of treaties that protect foreign investors from government actions. These treaties are like contracts between national governments, meant to entice investors to bring in projects with the promise of local jobs and access to new technologies.

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Does the world need hydrogen to solve climate change?

~ Đào Thu Hằng ~ 1 bình luận

carbonbrief.org

Hydrogen gas has long been recognised as an alternative to fossil fuels and a potentially valuable tool for tackling climate change.

Now, as nations come forward with net-zero strategies to align with their international climate targets, hydrogen has once again risen up the agenda from Australia and the UK through to Germany and Japan.

In the most optimistic outlooks, hydrogen could soon power trucks, planes and ships. It could heat homes, balance electricity grids and help heavy industry to make everything from steel to cement.

But doing all these things with hydrogen would require staggering quantities of the fuel, which is only as clean as the methods used to produce it. Moreover, for every potentially transformative application of hydrogen, there are unique challenges that must be overcome.

In this in-depth Q&A – which includes a range of infographics, maps and interactive charts, as well as the views of dozens of experts – Carbon Brief examines the big questions around the “hydrogen economy” and looks at the extent to which it could help the world avoid dangerous climate change.

What is hydrogen and how could it help tackle climate change?

Hydrogen is the lightest and most abundant element in the universe. It is also an explosive and clean-burning gas that contains more energy per unit of weight than fossil fuels.

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