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generation ago, the idea of a planet orbiting a distant star was still in the realm of science fiction. But since the discovery of the first exoplanet in 1988, we've found hundreds of them, with the discoveries coming at a faster rate over time.

But the vast majority of all these distant planets have one thing in common—with a few exceptions, they're too far away for us to see, even with our most powerful telescopes. If that's the case, how do astronomers know they're there?

WASHINGTON — President Trump announced on Thursday that the United States would withdraw from the Paris climate accord, weakening efforts to combat global warming and embracing isolationist voices in his White House who argued that the agreement was a pernicious threat to the economy and American sovereignty.

drawing support from members of his Republican Party but widespread condemnation from political leaders, business executives and environmentalists around the globe.

. The Paris agreement was intended to bind the world community into battling rising temperatures in concert, and the departure of the Earth’s second-largest polluter is a major blow.

“It was really moving to Texas that set me on this path of figuring out how to communicate about climate change,” she told me. “I was the only climate scientist within two hundred miles.”

She records the questions she is asked afterward, using an app, and the two most frequent are: “What gives you hope?” and “How do I talk to my [blank] about climate change?

In the late nineties, a Gallup poll found that forty-six per cent of Democrats and forty-seven per cent of Republicans agreed that the effects of global warming had already begun.

Machine learning models are increasingly augmenting human processes, either performing repetitious tasks faster or providing some systematic insight that helps put human knowledge in perspective.

Astronomers at UC Berkeley were surprised to find both happen after modeling gravitational microlensing events, leading to a new unified theory for the phenomenon.

Gravitational lensing occurs when light from far-off stars and other stellar objects bends around a nearer one directly between it and the observer, briefly giving a brighter — but distorted — view of the farther one.

The fact is, we still don’t know what life is.

since the days of Aristotle, scientists and philosophers have struggled to draw a precise line between what is living and what is not, often returning to criteria such as self-organization, metabolism, and reproduction but never finding a definition that includes, and excludes, all the right things.

If you say life consumes fuel to sustain itself with energy, you risk including fire; if you demand the ability to reproduce, you exclude mules. NASA hasn’t been able to do better than a working definition: “Life is a self-sustaining chemical system capable of Darwinian evolution.”

To really grasp the present, we need to imagine the future – then look back from it to better see the now. The angry climate kids do this naturally. The rest of us need to read good science fiction. A great place to start is Kim Stanley Robinson.

read 11 of his books, culminating in his instant classic The Ministry for the Future, which imagines several decades of climate politics starting this decade.

The first lesson of his books is obvious: climate is the story.

Mr. Rubio was asked how old the earth is. After declaring “I’m not a scientist, man,” the senator went into desperate evasive action, ending with the declaration that “it’s one of the great mysteries.”

Reading Mr. Rubio’s interview is like driving through a deeply eroded canyon; all at once, you can clearly see what lies below the superficial landscape. Like striated rock beds that speak of deep time, his inability to acknowledge scientific evidence speaks of the anti-rational mind-set that has taken over his political party.

that question didn’t come out of the blue. As speaker of the Florida House of Representatives, Mr. Rubio provided powerful aid to creationists trying to water down science education. In one interview, he compared the teaching of evolution to Communist indoctrination tactics — although he graciously added that “I’m not equating the evolution people with Fidel Castro.

As soon as you hit Google’s territorial waters, you came under our jurisdiction, our terms of service. Our laws–or lack thereof–apply here. By boarding our self-driving boat you granted us the right to all feedback you provide during your journey. This includes the chemical composition of your sweat.

Unified logins let us get to know our audience in ways we never could before. They gave us their locations so that we might better tell them if it was raining outside. They told us where they lived and where they wanted to go so that we could deliver a more immersive map that better anticipated what they wanted to do–it let us very literally tell people what they should do today. As people began to see how very useful Google Now was, they began to give us even more information. They told us to dig through their e-mail for their boarding passes–Imagine if you had to find it on your own!–they finally gave us permission to track and store their search and web history so that we could give them better and better Cards. And then there is the imaging. They gave us tens of thousands of pictures of themselves so that we could pick the best ones–yes we appealed to their vanity to do this: We’ll make you look better and assure you present a smiling, wrinkle-free face to the world–but it allowed us to also stitch together three-dimensional representations. Hangout chats let us know who everybody’s friends were, and what they had to say to them. Verbal searches gave us our users’ voices. These were intermediary steps. But it let us know where people were at all times, what they thought, what they said, and of course how they looked. Sure, Google Now could tell you what to do.

“We learned so much about regulation with Google Health. It turns out, the government has rules about health records, and that people care about these rules for some reason. So we began looking around for ways to avoid regulation. For example, government regulation meant it was much easier to experiment with white space in Kenya than in the United States. So we started thinking: What if the entire world looked more like Kenya? Or, even better, Somalia? Places where there are no laws. We haven’t adapted mechanisms to deal with some of our old institutions like the law. We aren’t keeping up with the rate of change we caused through technology. If you look at the laws we have, they’re very old. A law can’t be right if it’s 50 years old. Like, it’s before the Internet

On Wednesday, researchers reported that these may be the oldest fossils ever discovered, the remains of bacteria thriving on Earth not long, geologically speaking, after the very birth of the planet. If so, they offer evidence that life here got off to a very early start.

For decades, a small group of scientific dissenters has been trying to shoot holes in the prevailing science of climate change, offering one reason after another why the outlook simply must be wrong. Enlarge This Image Josh Haner/The New York Times A technician at a Department of Energy site in Oklahoma launching a weather balloon to help scientists analyze clouds. More Photos » Temperature Rising Enigma in the Sky This series focuses on the central arguments in the climate debate and examining the evidence for global warming and its consequences. More From the Series » if (typeof NYTDVideoManager != "undefined") { NYTDVideoManager.setAllowMultiPlayback(false); } function displayCompanionBanners(banners, tracking) { tmDisplayBanner(banners, "videoAdContent", 300, 250, null, tracking); } Multimedia Interactive Graphic Clouds and Climate Slide Show Understanding the Atmosphere Related Green Blog: Climate Change and the Body Politic (May 1, 2012) An Underground Fossil Forest Offers Clues on Climate Change (May 1, 2012) A blog about energy and the environment. Go to Blog » Readers’ Comments "There is always some possibility that the scientific consensus may be wrong and Dr. Lindzen may be right, or that both may be wrong. But the worst possible place to resolve such issues is the political arena." Alexander Flax, Potomac, MD Read Full Comment » Post a Comment » Over time, nearly every one of their arguments has been knocked down by accumulating evidence, and polls say 97 percent of working climate scientists now see global warming as a serious risk.

They acknowledge that the human release of greenhouse gases will cause the planet to warm. But they assert that clouds — which can either warm or cool the earth, depending on the type and location — will shift in such a way as to counter much of the expected temperature rise and preserve the equable climate on which civilization depends.

At gatherings of climate change skeptics on both sides of the Atlantic, Dr. Lindzen has been treated as a star. During a debate in Australia over carbon taxes, his work was cited repeatedly. When he appears at conferences of the Heartland Institute, the primary American organization pushing climate change skepticism, he is greeted by thunderous applause.

Astronomers recently announced that there could be an astonishing 20 billion Earthlike planets in the Milky Way

How abundant life actually is, however, hinges on one crucial factor: given the right conditions and the right raw materials,

what is the mathematical likelihood that life will actually would arise?

Tokyo University, known as Todai, is Japan’s best. Its exacting entry test requires years of cramming to pass and can defeat even the most erudite. Most current computers, trained in data crunching, fail to understand its natural language tasks altogether. Ms. Arai has set researchers at Japan’s National Institute of Informatics, where she works, the task of developing a machine that can jump the lofty Todai bar by 2021. If they succeed, she said, such a machine should be capable, with appropriate programming, of doing many — perhaps most — jobs now done by university graduates.

A recent study published by the Program on the Impacts of Future Technology, at Oxford University’s Oxford Martin School, predicted that nearly half of all jobs in the United States could be replaced by computers over the next two decades.

Intelligent machines could be used to replace expensive human resources, potentially undermining the economic value of much vocational education, Ms. Arai said.

Tegmark is more worried about much more immediate threats, which he calls existential risks. That’s a term borrowed from physicist Nick Bostrom, director of Oxford University’s Future of Humanity Institute, a research collective modeling the potential range of human expansion into the cosmos

"I am finding it increasingly plausible that existential risk is the biggest moral issue in the world, even if it hasn’t gone mainstream yet,"

Existential risks, as Tegmark describes them, are things that are “not just a little bit bad, like a parking ticket, but really bad. Things that could really mess up or wipe out human civilization.”

. As the Millennium Development Goals show, when we get our act together and start to behave like a single species on a single planet, we make progress.

We need to give governments and corporations a new dual mandate that requires them to work for their own populations and the whole of humanity, for their territory and the whole planet.

The truth is that many things on which your future health and prosperity depend are in dire jeopardy: climate stability, the resilience and productivity of natural systems, the beauty of the natural world, and biological diversity.

this is not the work of ignorant people. It is, rather, largely the result of work by people with BAs, BSs, LLBs, MBAs, and PhDs.

Ignorance is not a solvable problem, but rather an inescapable part of the human condition. The advance of knowledge always carries with it the advance of some form of ignorance.

Scientists have long labored to explain what appeared to be a slowdown in global warming that began at the start of this century as, at the same time, heat-trapping emissions of carbon dioxide were soaring. The slowdown, sometimes inaccurately described as a halt or hiatus, became a major talking point for people critical of climate science.

When adjustments are made to compensate for recently discovered problems in the way global temperatures were measured, the slowdown largely disappears, the National Oceanic and Atmospheric Administration declared in a scientific paper published Thursday. And when the particularly warm temperatures of 2013 and 2014 are averaged in, the slowdown goes away entirely, the agency said.

“The notion that there was a slowdown in global warming, or a hiatus, was based on the best information we had available at the time,” said Thomas R. Karl, director of the National Centers for Environmental Information, a NOAA unit in Asheville, N.C. “Science is always working to improve.”

No one was more influential — or more terrifying, some would say — than Paul R. Ehrlich, a Stanford University biologist. His 1968 book, “The Population Bomb,” sold in the millions with a jeremiad that humankind stood on the brink of apocalypse because there were simply too many of us. Dr. Ehrlich’s opening statement was the verbal equivalent of a punch to the gut: “The battle to feed all of humanity is over.” He later went on to forecast that hundreds of millions would starve to death in the 1970s, that 65 million of them would be Americans, that crowded India was essentially doomed, that odds were fair “England will not exist in the year 2000.” Dr. Ehrlich was so sure of himself that he warned in 1970 that “sometime in the next 15 years, the end will come.” By “the end,” he meant “an utter breakdown of the capacity of the planet to support humanity.”

In fact, birthrates are now below long-term replacement levels, or nearly so, across much of Earth, not just in the industrialized West and Japan but also in India, China, much of Southeast Asia, Latin America — just about everywhere except Africa, although even there the continentwide rates are declining. “Girls that are never born cannot have babies,”

Stewart Brand, founding editor of the Whole Earth Catalog. On this topic, Mr. Brand may be deemed a Keynesian, in the sense of an observation often attributed to John Maynard Keynes: “When the facts change, I change my mind, sir. What do you do?” Mr. Brand’s formulation for Retro Report was to ask, “How many years do you have to not have the world end” to reach a conclusion that “maybe it didn’t end because that reason was wrong?”

NASA has found a bacteria whose DNA is completely alien to what we know today. Instead of using phosphorus, the bacteria uses arsenic. All life on Earth is made of six components: carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur.

The implications of this discovery are enormous to our understanding of life itself and the possibility of finding beings in other planets that don’t have to be like planet Earth.