16-year-old Greta Thunberg met with Obama and chided senators, saying they're not trying hard enough to fight climate change
- Former President Barack Obama met with 16-year-old Swedish climate activist Greta Thunberg, who has become a prominent voice within the climate activism community for her demonstrations outside the Swedish parliament.
- During her visit to Washington, DC on Tuesday, Obama sat down with Thunberg to discuss her goals and messages for other young activists involved in her Fridays for Future strikes which encourage students and others around the world to strike for climate action.
- Obama said Thunberg's humble school strikes have transformed into a global movement and highlighted the power that young people have on the future of our planet.
- During Obama's tenure, he pledged to reduce the US' greenhouse gas emissions by 26% to 28% by 2025 under the Paris Climate Accord, and his administration put in place several climate regulations including curbs on coal and a 2013 plan to cut carbon pollution and encourage clean energy.
Splitting water to make cement could clean up a dirty industry
- Instead of burning fuel to heat a calciner to about 900°C (needed to liberate calcium oxide from CaCO3) they used electricity to split water.
- Electrolysis takes water and produces pure hydrogen and oxygen gases, but if you throw some CaCO3 in the mix, that turns into calcium hydroxide at the same time.
- Remember this process starts with splitting water, which produces hydrogen gas and oxygen, both of which could be used to power the kiln-heating step.
- Fortuitously, the amount of hydrogen and oxygen produced during the water-splitting step is roughly the right amount to fuel the kiln heating.
- What’s more, the water used at the start could theoretically all be recaptured at the end, as combusting hydrogen with oxygen produces water again and the kiln-heating process would release the rest.
- The water-splitting process does require about 30 percent more energy than a conventional coal-burning heat process, which means you need some pretty cheap electricity.
The galaxy cluster Abell 959
- Astronomers have detected massive clusters of galaxies, some with more mass than a hundred Milky Way galaxies, dating from as early as only about three billion years after the big bang, and their stars had to form at even earlier times.
- CfA astronomer Felipe Andrade-Santos was a member of a team that studied Abell 959, a galaxy cluster whose mass is that of about 3000 Milky-Way galaxies and which lies about three billion light-years away.
- All of the processes important to the formation of clusters like Abell 959 dissipate energy through shocks.
- Gas turbulence in the post-merger cluster also produces radio features—these are called giant radio halos.
- Abell 959 hosts one radio relic over twelve hundred light-years in length and five hundred in width, and also a giant radio halo.
The Trump administration doesn't want to talk about climate change, but it's already preparing to take advantage of the world climate change is creating
- Under the prodding of Mike Pompeo, the White House increasingly views the Arctic as a key arena for future great-power competition, with the ultimate prize being an extraordinary trove of valuable resources, including oil, natural gas, uranium, zinc, iron ore, gold, diamonds, and rare earth minerals.
- The scramble for the Arctic's resources was launched early in this century when the world's major energy firms, led by BP, ExxonMobil, Shell, and Russian gas giant Gazprom, began exploring for oil and gas reserves in areas only recently made accessible by retreating sea ice.
- He then began bragging about what the Trump administration had already accomplished, including promoting expanded oil and gas drilling in offshore waters and also freeing up "energy exploration in the Arctic National Wildlife Refuge," a pristine stretch of northern Alaska prized by environmentalists as a sanctuary for migrating caribou and other at-risk species.
Hong Kong's leading pro-democracy activist is urging US lawmakers to stop exporting tear gas made in Pennsylvania to Hong Kong police
- Hong Kong authorities have made international headlines in recent months following violent clashes with protesters.
- Police forces have often used non-lethal weapons such as rubber bullets, water cannons, and volleys of tear gas to disperse the immense crowds of protesters that have taken to the streets in recent months.
- Still, activists, including Wong, said the move was " too little, too late" and would press on with their demands that Hong Kong investigates incidents of police brutality against protesters, releases imprisoned activists, and holds fully democratic elections.
- Wong, who was arrested by Hong Kong police two weeks ago, told Business Insider he has been treated relatively well in police custody compared to his fellow activists, some of whom have been jailed for lengthy terms or reported being beaten or brutalized in police custody.
Grocery stores would run out of food in just 3 days if long-haul truckers stopped working
- The effects would hit hospitals, gas stations, ATMs, grocery stores, and even your garbage can.
- Government security forces escorted trucks with supplies to hospitals and doubled fines against striking truckers who were carrying medical cargo.
- Gas stations and grocery stores would start to run out of supplies.
- The ATA wrote that reports of a trucker work stoppage would stir up consumer panic, not unlike when hurricanes or other natural disasters lead to folks emptying grocery stores.
- The ATA said in its report that, with a strike as long as three days, essentials like bottled water, powdered milk, and canned foods would be gone.
- On average, trucks deliver purification chemicals to water supply plants every seven to 14 days.
- Without truck deliveries of purification chemicals, water supply plants will run out of drinkable water in 14 to 28 days.
The black hole at the center of our galaxy just belched two giant bubbles of radiation
- The region at the center of our galaxy is still full of mysteries, but astronomers have just found a clue to its past: Huge, radio-emitting bubbles, extending 700 light-years to either side of the galactic plane.
- They could be, the researchers believe, the result of a huge eruption from our galaxy's supermassive black hole, Sagittarius A*.
- Hints of the structures first emerged in the 1980s, when astronomer and physicist Farhad Yusef-Zadeh of Northwestern University and colleagues discovered something strange in the galactic center: long, thin, highly organised and highly magnetized filaments of gas, tens of light-years long and just one light-year wide, emitting synchrotron radio waves.
- This eruption was possibly triggered by vast amounts of interstellar gas falling in on the black hole, or a massive burst of star formation which sent shockwaves careening through the galactic center.