More U.N. Climate Nonsense
Secretary-General of the United Nations António Guterres went even further in a Tuesday speech, claiming that fossil fuels are much more heavily subsidized than his beloved alternative energy projects and suggesting that wind and solar are the clear marketplace winners:
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News24
24 minutes ago
- News24
‘That's going to be my legacy': Siviwe Gwarube plans to ‘turn education system on its head'
Siviwe Gwarube talks to News24 about her determination to turn SA's education system on its head. Be among those who shape the future with knowledge. Uncover exclusive stories that captivate your mind and heart with our FREE 14-day subscription trial. Dive into a world of inspiration, learning, and empowerment. You can only trial once. Start your FREE trial now Show Comments ()
Chicago Tribune
43 minutes ago
- Chicago Tribune
Israel says hundreds of truckloads of aid are waiting to enter Gaza. Why can't the UN bring them in?
TEL AVIV, Israel — The United Nations and experts say that Palestinians in Gaza are at risk of famine, with reports of increasing numbers of people dying from causes related to malnutrition. Yet Israel says hundreds of truckloads of aid are waiting at the border for the U.N. to distribute in Gaza. On Thursday, Israel's military took journalists to the Gaza side of the Kerem Shalom crossing where hundreds of boxes of aid were on pallets filling a huge lot. Israel says it has allowed in around 4,500 aid trucks since it lifted a total blockade in May —around 70 truckloads a day, one of the lowest rates of the war and far less than the several hundred the U.N. says are needed each day. Israel says it lets in enough aid and faults U.N. agencies for not doing enough to retrieve and get it to those in need. The U.N. says it is hampered by Israeli military restrictions on its movements and incidents of criminal looting. Here's a look at why the aid can't be delivered. To retrieve the aid at the border — or move around most of the Gaza Strip — U.N. trucks must enter zones controlled by the military after obtaining its permission. Once the aid is loaded, the trucks must get safely to the population. The whole trip can take 20 hours, the U.N. says. Large crowds of desperate people, as well as criminal gangs, overwhelm trucks as they enter and strip off the supplies. Witnesses say Israeli troops regularly open fire on the crowds, causing deaths and injuries. 'Taken together, these factors have put people and humanitarian staff at grave risk and forced aid agencies on many occasions to pause the collection of cargo from crossings controlled by the Israeli authorities,' said Olga Cherevko, a spokesperson for the U.N. Office for the Coordination of Humanitarian Affairs, or OCHA. At least 79 Palestinians were killed while trying to get aid entering Gaza this week, according to Gaza's health ministry. A U.N. official who was not authorized to discuss the issue publicly and spoke on condition of anonymity, said Israeli forces opened fire toward crowds who tried to take food from an entering truck convoy. Israel's military said soldiers shot at a gathering of thousands of Palestinians in northern Gaza who posed a threat, and it was aware of some casualties. On its website, OCHA said there is a breakdown of law and order, which is partly due to the collapse of Gaza's Hamas-run civilian police force, leading to insecurity at the crossings and for convoys moving within Gaza. It said this is further compounded by the increase of armed gangs. The military frequently assigns routes for trucks to use that are 'unsuitable, either impassable for long truck convoys, passing through crowded markets, or controlled by dangerous gangs,' OCHA said. When the U.N. objects to a route, the military provides few alternatives, it said. The U.N. also struggles with facilitation from the military. It says more than half its movement requests, 506 out of 894, were either denied or impeded by the military in May, June and July. There are also regular delays by Israel's forces in coordination. The delays result in lost time, difficulty planning and wasted resources as convoys spend hours waiting for the 'green light to move only to be denied,' OCHA said. Israel says it doesn't limit the truckloads of aid coming into Gaza and that assessments of roads in Gaza are conducted weekly where it looks for the best ways to provide access for the international community. Col. Abdullah Halaby, a top official in COGAT, the Israeli military agency in charge of transferring aid to the territory, said there are several crossings open. 'We encourage our friends and our colleagues from the international community to do the collection, and to distribute the humanitarian aid to the people of Gaza,' he said. An Israeli security official who was not allowed to be named in line with military procedures told reporters this week that the U.N. wanted to use roads that were not approved. He said the army offered to escort the aid groups but they refused. For much of the war, U.N. agencies were able to safely deliver aid to those who need it, despite Israeli restrictions and occasional attacks and looting. The Hamas-run police provided public security. But as Israeli airstrikes targeted the police force, it has been unable to operate. The U.N. says being escorted by Israel's army could bring harm to civilians, citing shootings and killings by Israeli troops surrounding aid operations. The U.N. and aid groups also say that looting of trucks lessens or stops entirely when enough aid is allowed into Gaza. 'The best protection for us is community buy-in,' said U.N. spokesperson Stephane Dujarric. 'And to get that community buy-in, communities have to understand that trucks will come every day, that food will come every day.' 'That's what we're asking for,' he said.
Yahoo
an hour ago
- Yahoo
Interstellar Meteors Hit Earth All the Time but Still Elude Astronomers
Astronomers think small space rocks from beyond our solar system routinely strike Earth—but proving it isn't easy Aliens are visiting our solar system. Not little green men, sadly, but natural alien objects—cosmic bodies such as comets and asteroids born elsewhere in the galaxy that zip by the sun as they drift through the Milky Way. They're not so much visiting as just passing through. Though these objects were speculated to exist for a long time, we didn't know they were out there for sure until October 2017, when astronomers noticed a small body moving through space at exceptionally high speed. Observations over just a few nights showed it was moving far too quickly to be orbiting the sun and thus must have come from some other star. It was our first known interstellar visitor. [Sign up for Today in Science, a free daily newsletter] Eventually designated 1I/'Oumuamua, it was 30 million kilometers from Earth and already outward bound from the solar system when it was discovered, offering scant time for follow-up studies. But then, less than two years later, a second such object was found, also moving far faster than usual. 2I/Borisov turned out to be a comet very similar to those we're familiar with, except for its trajectory, which clearly showed it came from interstellar space. And now a third such alien body is barreling through the solar system: 3I/ATLAS, moving so rapidly its path is barely bent at all by the sun's gravity as it zooms past. In science, one is an anomaly and two might be coincidence, but three is a trend. Clearly, objects like this are passing by on the regular. Roughly speaking, there could be ones 100 meters in size or larger passing through the inner solar system at any time. Given their speed and intrinsic faintness, though, they're difficult to detect. We also know that when it comes to things such as asteroids and comets, nature tends to make many more smaller ones than bigger ones. In our own solar system, for example, only a couple of dozen main-belt asteroids are bigger than 200 km wide, but more than a million are 1 km across or larger. This generalization should hold for interstellar interlopers as well. For every kilometer-scale one that we see, there should be far more that are smaller. In fact, there could be millions of sand-grain-sized alien objects whizzing past us right now. And we already know that they're out there: in 2014 astronomers announced they had found seven grains of cosmic dust brought down to Earth from the Stardust space probe, which was designed to catch material ejected from a comet. Also, embedded in some meteorites that have hit Earth are tiny bits of material, called presolar grains, that are so old they actually formed around other stars. They got here after being blown across the void of space into the collapsing cloud of gas and dust that formed the sun and planets 4.6 billion years ago. Larger material could be ejected from an alien planetary system if it's given a gravitational assist when passing by a planet there, or it could be torn away from its parent star by another star passing closely to that system. So it seems certain interstellar jetsam would occasionally hit our planet. Earth is a small target, but with so many galactic bullets, you'd think some would actually find their way to our planetary bull's-eye. The problem is detecting them. Every day Earth is hit by very roughly 100 tons of locally grown interplanetary debris—material ejected from asteroids and comets native to our solar system—which translates into billions of tiny specks zipping across our sky daily. Detecting the tiny fraction that have an interstellar origin is tough. And the difficulty is not just in the sheer numbers. It's in tracing the trajectories of that small handful across the sky back up into space to calculate their orbits. When an object such as a planet or an asteroid orbits the sun, we say it's gravitationally bound to our star. That orbit in general is an ellipse, an oval shape. These can be defined mathematically, with the key factor being the eccentricity: how much the ellipse deviates form a circle. A perfect circle has an eccentricity of 0, and the higher the eccentricity, the more elliptical the orbit, up to a value of just under 1. An orbit with an eccentricity of 0.99, say, is extremely elongated; you might find that an object dropping down very close to the sun from the outer solar system has an eccentricity that high. It's possible to have an eccentricity higher than 1 as well. That kind of trajectory is called hyperbolic—named after the mathematical curve, not because it's exaggeratedly over-the-top—and an object on this path is not bound to the sun gravitationally. Once it's heading out, it's gone forever. It ain't coming back. This is how we know 'Oumuamua, Borisov and ATLAS are from interstellar space; each has an eccentricity greater than 1—'Oumuamua's is about 1.2 and Borisov's 3.4, which is quite high, but ATLAS has them both beat with an astonishing eccentricity of 6.2. That's extraordinarily high and also indicates it's hauling asteroid (or, more accurately, it's not comet back). Do we see any meteors with eccentricities like these? If the exact path of a meteoroid (the term for the solid bit that burns up in the air and becomes a meteor) through Earth's atmosphere can be determined, that can be backtracked up into space, allowing the object's trajectory, including its eccentricity, to be calculated. This can be done with multiple sky cameras set up in various locations; if a meteor streaks across their field of view, the multiple vantages can allow astronomers to triangulate on the rock and measure its path. There are quite a few such camera networks. It's actually difficult getting good enough data to determine solid orbits for meteoroids, though. Many do have eccentricities very close to 1; these likely come from long-period comets that originate out past Neptune. NASA's Jet Propulsion Laboratory maintains a database of bright fireballs—exceptionally luminous meteors—at the Center for Near-Earth Object Studies (CNEOS). The earliest recorded meteors in the database date back to 1988, so there is a rich hunting ground in the data. Are any of the meteors listed hyperbolic? Unfortunately, no. At least, not unambiguously—there have been false positives but nothing clear-cut. Additionally, a study from 2020 looked at 160,000 measurements by the Canadian Meteor Orbit Radar covering 7.5 years. The researchers found just five potential interstellar meteors. The results aren't quite statistically strong enough to claim detections for sure, but they're very compelling. What we need are more eyes on the sky, more meteor camera networks that can catch as many of these pieces of cosmic ejecta burning up in our atmosphere as possible. It's a numbers game: the more we see, the more likely we'll see some that are not from around here. The science would be, well, stellar: these meteors can tell us a lot about the environments around other stars, the ways they formed and perhaps even the stars they come from. We're getting physical samples from the greater galaxy for free. We should really try to catch them. Hat tip to planetary scientist Michele Bannister for the link to the CNEOS article. Solve the daily Crossword
