A major new UN assessment finds that the world’s great freshwater fish migrations are rapidly collapsing, threatening ecosystems, fisheries, and the livelihoods of hundreds of millions of people. Being released by the Convention on the Conservation of Migratory Species (CMS) at its COP15 in Brazil, the Global Assessment of Migratory Freshwater Fishes identifies 325 species requiring coordinated international conservation action, their declines driven by dams, habitat fragmentation, pollution, overfishing, and climate change. Migratory freshwater fish populations have fallen by about 81% since 1970, making them among the most imperiled wildlife on Earth. Because many species migrate across national borders through shared river basins such as the Amazon, Mekong, Danube, Nile, and Ganges–Brahmaputra, the report stresses that effective protection depends on countries managing rivers as connected systems. At CMS COP15, governments will consider new basin-scale action plans, conservation listings, and other initiatives to protect iconic long-distance migrant species such as the massive Amazonian catfish.

Nations around the globe are grappling with a massive dual challenge: maintaining economic momentum while drastically slashing carbon outputs. Many policymakers have placed their bets on the digital economy as a modern solution for climate change. However, the exact mechanics of how data and connectivity actually clean up our air have remained somewhat murky. Now, a comprehensive evaluation of 259 Chinese cities cuts through the noise, mapping exactly how digital transformation drives environmental progress.

It is well known that pollution damages ecosystems, but putting a precise price tag on that damage, and figuring out how government budgets can effectively lower it,is a complex puzzle. Rather than simply tallying up carbon emissions, a fresh economic analysis looks directly at the actual financial burden of pollution across six Mediterranean nations. The conclusion? Policy synchronization is the ultimate money-saver, and political hesitation is incredibly expensive.

Kyoto, Japan -- In April 2021 the United States hosted the Leaders Summit on Climate, where many of the world's most powerful countries -- and largest carbon emitters -- committed to net-zero emissions targets. Many also made pledges to divest from fossil fuels and invest in green finance. Since then, the capacity for renewable energy and sales of electric vehicles have increased. Yet progress toward system-level transformations is still moving at a snail's pace.

Meeting these targets will depend on commitments from more than just the wealthiest nations. Given the size of their populations, economies, and greenhouse gas emissions, developing economies in Southeast Asia will also play essential roles in the transition to net-zero.

In a new book, a collaborative team of researchers including Akihisa Mori from Kyoto University, focuses on the net-zero transition in Southeast Asia, applying the lessons from the Leaders Summit on Climate to these countries. The researchers wanted to understand whether financial pledges, such as fossil fuel divestment and green finance, can help financial systems overcome the tradeoff between net-zero transitions and sustainable development in emerging markets and developing economies.