Technology Climate change is making baby sharks smaller, undernourished and exhausted

07:41  13 january  2021
07:41  13 january  2021 Source:   cnn.com

What Biden can do to "reverse the trajectory" on climate change

  What Biden can do to If President-elect Joe Biden has his way, the tide is about to turn on climate policy. But how much could he really do without Senate support?But if President-elect Joe Biden has his way, the tide is about to turn. Mr. Biden's climate agenda is among the most aggressive set of plans any nation has laid out. Questions remain, however, about how much can the Biden administration can get done on this issue, especially if Democrats do not gain control of the Senate.

Baby sharks are being born smaller, undernourished and exhausted as climate change warms the world's oceans, researchers say.

Epaulette shark (Hemiscyllium ocellatum) © Shutterstock Epaulette shark (Hemiscyllium ocellatum)

Researchers examined the effects of warming temperatures on the growth, development and physiology of the Great Barrier Reef's epaulette sharks, testing embryos and hatchlings in waters up to 31 degrees Celsius (87.8 degrees Fahrenheit).

The research team found that in warmer waters, shark embryos grew faster and used their yolk sac -- their only source of food in this developmental stage -- quicker.

The creatures hatched earlier, were born smaller, and needed to feed straight away, but lacked energy, researchers from Australia's ARC Centre of Excellence for Coral Reef Studies at James Cook University and the University of Massachusetts said Tuesday.

Biden names John Kerry as presidential climate envoy

  Biden names John Kerry as presidential climate envoy President-elect Joe Biden will name former secretary of state John Kerry as a presidential envoy on climate, according to his transition team, signaling his commitment to elevating the issue of climate change under his administration. As the presidential envoy for climate, Kerry will report directly to Biden as part the White House’s National Security Council, underscoring how the incoming administration views the warming planet as an issue with implications for both national defense and foreign policy.

There are more than 500 types of shark living around the world, and the majority give birth to live young. Some shark species, like epaulette sharks, lay eggs, which are left unprotected and must be able to survive on their own for up to four months.

"The epaulette shark is known for its resilience to change, even to ocean acidification," Jodie Rummer, co-author and associate professor at the ARC Centre of Excellence for Coral Reef Studies, said in a statement. "So, if this species can't cope with warming waters then how will other, less tolerant species fare?"

The Great Barrier Reef is the world's largest coral reef, covering nearly 133,000 square miles and is home to more than 1,500 species of fish, 411 species of hard corals and dozens of other species.

A deep dive into the San Jose Sharks' salary-cap situation

  A deep dive into the San Jose Sharks' salary-cap situation Though loaded with plenty of prospects on entry-levels, the Sharks are feeling the negative effects of locking up all their aging veterans on long-term deals, many of which are on the wrong side of 30. Karlsson hasn’t looked like the dominant blueliner they thought they acquired from Ottawa two years ago. Karlsson, now 30, has dealt with continual injuries in his two years in San Jose and despite solid numbers (six goals, 40 points in 56 games), the team was hoping for a game-changing player when they brought him aboard and signed him for an $11.5M AAV. Burns is no different.

The past decade has been the warmest on record for global ocean temperatures. By the end of the century, the Great Barrier Reef is likely to experience average summer temperatures close to or exceeding 31 degrees Celsius, researchers warn.

Rummer said that rising ocean temperatures could threaten future sharks, including egg-laying and live-bearing species, because as temperatures rise, the creatures will be born or hatch into environments that they can barely tolerate.

"The study presents a worrying future given that sharks are already threatened," lead author Carolyn Wheeler said in a statement.

"Sharks are important predators that keep ocean ecosystems healthy. Without predators, whole ecosystems can collapse, which is why we need to keep studying and protecting these creatures," Wheeler, a PhD candidate at the ARC Centre of Excellence for Coral Reef Studies, added.

The Energy 202: These are the top climate stories of 2020

  The Energy 202: These are the top climate stories of 2020 A presidential election, a pandemic and extreme weather shaped environmental news this year. A presidential election. A national reckoning over race and justice in America. A worldwide pandemic that ground economies to a halt.

"Our future ecosystems depend (on) us taking urgent action to limit climate change," Rummer said.

The study was published in the Scientific Reports journal.

Oceans serve as a good indicator of the real impact of climate change -- covering almost three quarters of Earth's surface, they absorb the vast majority of the world's heat.

Although we often can't see it, ocean warming has a profound impact on the entire world. A warmer ocean causes sea level to rise, bringing problems like dangerous coastal flooding. It leads to the loss of sea ice, heating the waters even further, and can affect the jet stream, allowing cold Arctic air to reach farther south, making winters more intense and threatening animals that depend on sea ice.

A warmer ocean also contributes to increases in rainfall and leads to stronger and longer-lasting storms like Hurricanes Florence and Harvey.

Marine heatwaves which have killed off swathes of Earth's coral reefs have likely doubled in frequency and are projected to become more common and intense, a landmark report from the United Nations' Intergovernmental Panel on Climate Change found in 2019.

Five things Biden should do to tackle the climate emergency .
Biden has a model for mobilizing a unified national response: His own COVID-19 strategy. First, develop a national strategy for victory. Biden's COVID-19 plan presents a comprehensive national strategy for ending the pandemic. While many have despaired of defeating climate change, the truth is we can do it. It certainly won't be easy, but broadly speaking, we know what we need to do: Restore the climate conditions that supported the rise of human civilization. That means returning greenhouse gas concentrations and global temperatures to pre-industrial levels as quickly as possible.

usr: 0
This is interesting!