climate change tagged posts

Despite the impacts of the coronavirus pandemic, the world mustn’t forget the “deeper environmental emergency” facing the planet. That’s the view of the UN Secretary General Antonio Guterres, in remarks released to celebrate Earth Day. The toll taken by the virus is both “immediate and dreadful”, Mr Guterres says.

But the crisis is also a wake-up call, “to do things right for the future,” said the Secretary General.

Mr Guterres re-iterated his view that the coronavirus is the biggest challenge the world has faced since the Second World War.

But as the world commemorates the 50th anniversary of Earth Day, the planet’s “unfolding environmental crisis” is an “even deeper emergency”, he says.

“Biodiversity is in steep decline,” Mr Guterres stated.

“Climate disruption is approaching a point o...

Despite being treated as humanity’s rubbish dump for decades, the oceans of the world are proving remarkably resilient, says a new scientific review. Building on that resilience could lead to a full recovery within three decades, the researchers argue.

Climate change, and the challenges of scaling up existing conservation efforts, are the big hurdles, they say.

The researchers caution that the window for action is now very narrow.

• UN panel signals red alert on ‘Blue Planet’
• Ocean plastic tide ‘violates the law’
• Ocean plastic could triple in decade

The oceans have been exploited by humans for centuries, but the negative impacts of our involvement have only become clear over the last 50 years or so.

Fish and other marine species have been hunted almost to extinction, while oil spills and ...

In the midst of the COVID-19 crisis, many people are dreaming of Florida as a retreat from long days of self-isolation. Hundreds of miles of beautiful beaches, azure skies, shimmering oceans, teeming wilderness including barrier reefs and the Everglades, and strands of picturesque keys and islets. But this paradise is staring down a menace of its own — a rising sea level — and it’s time for a paradigm shift to help us save the Sunshine State. How that battle plays out will have huge implications for other coastal regions across the rest of the United States.

Floridians are experiencing the undeniable impacts of sea level rise firsthand on a daily basis. For Florida’s environment, the signs of danger and damage are everywhere. Saltwater is inundating the Florida Bay, exacerbating an...

Climate change is threatening the world’s coral reefs, and saving them all will prove impossible. A team from EPFL has developed a method for identifying corals with the greatest adaptive potential to heat stress. The research, published in the journal Evolutionary Applications, should support improved and better-targeted marine biodiversity conservation strategies.

We know this can happen because such changes have already been widely observed. But our research, now published in the journal Nature Communications, shows that the size of the ecosystem is important. Once a “tipping point” is triggered, large ecosystems could collapse much faster than we had thought possible. It’s a finding that has worrying implications for the functioning of our planet.

We started off by wondering how the size of the ecosystem might affect the time taken for these changes (ecologists call them “regime shifts”) to happen. It seems intuitive to expect large ecosystems to shift more slowly than small ones. If so, would the relationship between shift time and size be the same for lakes, corals, fisheries, and forests?

We began by analyzing data for about 40 regime...

Earth’s great ice sheets, Greenland and Antarctica, are now losing mass six times faster than they were in the 1990s thanks to warming conditions. A comprehensive review of satellite data acquired at both poles is unequivocal in its assessment of accelerating trends, say scientists.

Between them, Greenland and Antarctica lost 6.4 trillion tonnes of ice in the period from 1992 to 2017.

This was sufficient to push up global sea-levels by 17.8mm.

“That’s not a good news story,” said Prof Andrew Shepherd from the University of Leeds in the UK.

“Today, the ice sheets contribute about a third of all sea-level rise, whereas in the 1990s, their contribution was actually pretty small at about 5%. This has important implications for the future, for coastal flooding and erosion,” he told BBC News.

T...

A study by researchers at Brown University has found a quarter of posts about climate change on Twitter were written by bots. Bots are computer programs that can masquerade as humans to post or send messages on social media. Researchers discovered tweets posted by bots created the impression there was a high level of climate change denial.

The paper detailing the finds has not yet been published and was first reported by The Guardian newspaper.

The research team analysed 6.5 million tweets from the period surrounding President Donald Trump’s June 2017 announcement that he was removing the United States from the Paris climate accord.

The finding showed 25% of tweets on climate change were likely posted by bots...

The bottom of the sea can be a gassy place. Underwater volcanoes and vents spew carbon dioxide (CO2) near the crevices where tectonic plates rift apart. Hungry bacteria convert decomposing creatures of the deep into natural methane. And, new research from Japan reminds us, enormous, miles-wide reservoirs of greenhouse gases lurk in untouched pockets just below the seafloor.

In a study published Aug. 19 in the journal Geophysical Research Letters, a team of researchers discovered one such pocket at the bottom of the Okinawa Trough, a massive submarine basin sitting southwest of Japan where the Philippine Sea plate is slowly sinking below the Eurasian plate. Using seismic waves to map the trough’s structure, the team found a huge gas pocket stretching at least 2...

Ocean acidification refers to the process of our planet’s oceans becoming more acidic due to the global increase in carbon dioxide emissions. Since the Industrial Revolution, experts estimate that Earth‘s oceans have absorbed more than a quarter of the atmospheric carbon dioxide (CO2) released from the burning of fossil fuels. Once in the ocean, the dissolved carbon dioxide undergoes a series of chemical reactions that increase the concentration of hydrogen ions while lowering the ocean’s pH and carbonate minerals — a process called ocean acidification.

Studies have shown that ocean acidification could have dramatic consequences for marine life and communities whose livelihoods depend on our ocean’s resources.

What causes ocean acidification?

When carbon dioxide from the atmosphere is ...

In a new report about how the world’s coral reefs face “the combined threats of climate change, pollution, and overfishing”—endangering the future of marine biodiversity—a London-based nonprofit calls for greater global efforts to end the climate crisis and ensure the survival of these vital underwater ecosystems. The report, entitled Marine Havens Under Threat: The impacts of the climate crisis on tropical coral reefs and the communities that rely on them (pdf), was published Wednesday by the Environmental Justice Foundation (EJF).

EJF warns that because of human activities that heat and pollute the planet, coral reefs “are under imminent risk of destruction,” pointing to a recent estimate from the United Nations’ Intergovernmental Panel on Climate Change (IPCC) that global warming o...