Climate Change ☀️
Modelling ancient Antarctic ice sheets helps us see future of global warming
Last month saw the average concentration of atmospheric carbon dioxide (CO2) climb to almost 418 parts-per-million, a level not seen on Earth for millions of years. In order to get a sense of what our future may hold, scientists have been looking to the deep past. Now, new research from the University of Massachusetts Amherst, which combines climate, ice sheet and vegetation model simulations with a suite of different climatic and geologic scenarios, opens the clearest window yet into the deep history of the Antarctic ice sheet and what our planetary future might hold.
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How The U.S. Could Halve Climate Emissions By 2030
Next week, President Biden will announce a number that could shape the rest of his presidency: a new goal to cut U.S. greenhouse gas emissions.

The announcement marks the country's renewed commitment to the Paris accord, the international climate change agreement that former President Trump withdrew from. Environmental groups, scientists and major business leaders are urging the Biden Administration to cut emissions 50 percent by 2030, as compared to 2005 levels.

That target lines up with scientific assessments of the reductions needed to avoid the worst impacts of climate change. To limit warming to 1.5 degrees Celsius, emissions need to drop to net-zero by 2050. Above that and sea levels rise to extreme heights, heat waves get more intense, and hurricanes and wildfires become even more destructive.

A 50 percent cut would not be the world's most aggressive target, but it would put the U.S. among the four most ambitious countries. Going back to 1850, the U.S. has pumped more emissions into the atmosphere cumulatively than any other nation.

Still, achieving that target by 2030 won't be simple, requiring both political buy-in and a sweeping deployment of cleaner cars and clean energy sources.

"It's pretty ambitious," says Danielle Arostegui, senior analyst at the Environmental Defense Fund. "This is not an easy target to achieve but we think it is something that is achievable if we really put the pedal to the metal here and put these policies in place that we need to actually get there."

What would it take? Based on research from universities and advocacy groups, here's what the U.S. might look like in 2030.

  • Renewable energy takes over, coal fades away
  • Car dealerships look very different
  • Buildings, industrial plants and land all get in the game
With just nine years to implement these programs, climate experts say speed will be key. Many policies take years to develop and then, more years to affect overall emissions. As other countries evaluate their own emissions targets in preparation for climate negotiations this fall, they'll be looking to the U.S. to see if its commitments are more than just words.
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Long-term consequences of CO2 emissions
According to a new study, the oxygen content in the oceans will continue to decrease for centuries even if all CO2 emissions would be stopped immediately. The slowdown of ocean circulation and the progressive warming of deeper water layers are responsible for this process.

The life of almost all animals in the ocean depends on the availability of oxygen, which is dissolved as a gas in seawater. However, the ocean has been continuously losing oxygen for several decades. In the last 50 years, the loss of oxygen accumulates globally to about 2% of the total inventory (regionally sometimes significantly more). The main reason for this is global warming, which leads to a decrease in the solubility of gases and thus also of oxygen, as well as to a slowdown in the ocean circulation and vertical mixing. A new study published today in the scientific journal Nature Communications shows that this process will continue for centuries, even if all CO2 emissions and thus warming at the Earth's surface would be stopped immediately.
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New York is about to spew a lot more carbon into the air, thanks to Andrew Cuomo and anti-vaccine activist Robert F. Kennedy, Jr.'s anti-nuclear crusade
  • Andrew Cuomo and the anti-vaccine activist Robert F. Kennedy, Jr. pushed to close the Indian Point nuclear power plant.
  • But without nuclear energy, New York needs to burn a lot more fossil fuels to produce electricity.
  • This anti-science fearmongering in the name of environmentalism will, ironically, lead to more carbon emissions spewed into the air.
New York's air is about to be filled with a whole lot more carbon dioxide, thanks in large part to the efforts of a couple of science-denying scions of political dynasties who claim to be acting in the interests of the environment.

The Indian Point nuclear power plant — located in Buchanan, New York, about 30 miles north of Manhattan — is slated to have its third and final reactor permanently shut down by the end of April, thanks to an order signed by New York Gov. Andrew Cuomo in 2017.

Robert F. Kennedy, Jr. — Cuomo's former brother-in-law — and his activist group Riverkeeper have agitated for decades to shut down Indian Point. To make the case, Kennedy's thrown just about every scare-mongering worst-case scenario at the wall, regardless of its plausibility or scientific merit.

This is par for the course for RFK, Jr., a notorious anti-vaccine conspiracy theorist, who was one of the most prominent spreaders of misinformation with regards to the fully debunked theory that vaccines lead to childhood autism.

Indian Point's closure is being celebrated as a long and hard-fought win for environmentalists.

In reality, it's a pyrrhic victory.

It's very simple: No nuclear power means more fossil fuel burning, and more carbon emissions.
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Climate change, periodic modification of Earth’s climate brought about as a result of changes in the atmosphere as well as interactions between the atmosphere and various other geologic, chemical, biological, and geographic factors within the Earth system.

Source: Climate change - Evidence for climate change | Britannica
Climate Change is the defining issue of our time and we are at a defining moment. From shifting weather patterns that threaten food production, to rising sea levels that increase the risk of catastrophic flooding, the impacts of climate change are global in scope and unprecedented in scale. Without drastic action today, adapting to these impacts in the future will be more difficult and costly.

Source: Climate Change | United Nations