It's true that quite a few most respected scientific authorities have confirmed that the world is becoming hotter and hotter. There^'s also strong evidence that humans are contributing to the warming. Countless recent reports have proved the same thing. For instance, a 2010 summary about the climate science by the Royal Society noted that: The global warming over the last half - century has been caused mainly by human activity.”

    You may not believe that humans could change the planet's climate, but the basic science is well understood. Each year, billions of tons of greenhouse gases are released into the atmosphere because of human activity. As has been known for years, these gases hold heat that would otherwise escape to space, wrapping the planet in an invisible blanket.

    Of course, the earth's climate has always been changing due to “natural” factors such as volcanic eruption or changes in solar, or cycles concerning the Earth's going around the sun. According to the scientific research, however, the warming observed by now matches the pattern of warming we would expect from a build - up of greenhouse gas in the atmosphere - not the warming we would expect from other possible causes.

    Even if scientists did discover another reasonable explanation for the warming recorded so far, that would give birth to a difficult question. As Robert Henson puts it: “If some newly discovered factor is to blame for the climate change, then why aren't carbon dioxide and the other greenhouse gases producing the warming that basic physics tells us they should be?”

    The only way to prove with 100% certainty that humans are responsible for global warming would be to run an experiment with two identical Earths-one with human influence and one without. That obviously isn't possible, and so most scientists are careful not to state human influence as an absolute certainty.

    One night about nine o'clock, Dr. Eyck, a surgeon, had a phone call from Dr. Haydon at the hospital in Clens Falls. The surgeon was asked to go there at once to operate on a very sick boy who shot himself while playing with a gun.

    The doctor was soon on his way to Clens Falls. It was 60 miles away. And it was snowing heavily in the city. The surgeon thought he could get there before 12 o'clock.

    A few minutes later, the doctor was stopped by a man in an old black coat. Gun in hand, the man ordered the doctor to get out. Then the man drove the car down the road, leaving the doctor in the falling snow.

    It was after 2 o'clock in the morning when the doctor arrived at the hospital in Clens Falls. Dr. Haydon told him that the boy had died an hour before. The two doctors walked by the door of the hospital waiting room. There sat the man in the old black coat with his head in his hands“Mr. Cuninghan,”said Dr. Haydon to the man, “This is Dr. Eyck. He is the surgeon who walked all the way from Albany to save your boy.”

    Alaska Airlines has the cheapest fares around, but you receive superb service unequal to its price. In case you don't know, Alaska Airlines does not just go to Alaska, but includes states such as Washington, California, and Hawaii. Our prices are reasonable and we offer great service.

    Alaska Airlines is generous. For each bag you check in, it must weigh 50 pounds or less, which is extremely generous for domestic flights. Your baggage is allowed to be up to 62 inches in length. You're also allowed one carry-on bag in addition to one personal item which can be a purse, a laptop computer, or a briefcase.

    Not only do we give you the cheapest airfare, but we offer you a visa card which you can earn plenty of miles on. Upon approval, you will receive 25,000 Bonus Miles. From then on, for each dollar you charge to this card, you will receive 3 miles and there's no limit to the amount of miles you can earn. You also receive a $99 round-trip discount code for a Companion Ticket each year for using this card. This is a sweet deal and very generous. Think about all of your purchases you make during the month. Now multiply that by three. You're talking about a free trip cross country in just a few short months. Wow!

    Alaska Airlines receives great reviews for its performance, punctuality, and professional service. In addition to its great reviews from customers, Alaska Airlines has received lots of awards and recognitions. Network Carriers in North America has rated Alaska Airlines for the highest in customer satisfaction for the past 4 years. We have also received the Executive Travel's leading edge Award. We were also named on the 2011 Washington Green 50 list.

    Alaska Airlines is quickly gaining the recognition it deserves. We're adding higher expectations to the flying experience. Try it out.

    One Moore Elementary school teacher is showing students the importance of communication through “shout-outs”. Third Grade Moore Elementary Teacher Lindsey Winders said a shout-out is a compliment(称赞) that students can say or write down. “Like, 'hey I noticed you doing a really great job solving your math problems yesterday. I wanted to make sure you know that I saw you do that,'” Winders said.

    Winders said she makes sure she is giving shout-outs to her students every day. “I might write them a sticky note, or write them a quick little note in their planner. I might just say it to them on their way into the classroom or on their way out of the classroom, but most importantly I try to do it every day,” Winders said.

    In addition to the compliments, Winders has the students greet(问候) each other every morning during morning meeting. She will have students give examples to the class of how to communicate in different settings(场景). Third grade student Nayelli Moranchel said she had given at least six shout-outs this year. “It makes me happy, because they always write something back,” Moranchel said.

    Recently, Winders took it one step further and wrote a personalized note on each of her students' desk. “In our classroom, sometimes it can be challenging for me to give a compliment or a shout-out to each and every one of them in a way that feels equal(平等的) and valuable at the same time. So I decide that there is no better way than leaving a note on their desk that can stay for as long as they wants it to,” Winders said.

    Winders said it is encouraging when she sees her students copy the act, and give each other compliments without her guidance(指导).

    Apple and Microsoft each launched new products. One company astonished everyone. The other made people sleepy. Can you guess which was which? You probably guessed wrong. Because Apple, famous for its creative products, was the tech giant whose new product caused a collective shrug. While Microsoft, which stole a move out of the Apple Playbook, won cheers from high-end, creative-class consumers like business analysts, media designers and music producers.

    As Hayley Tsukayama remarked at The Washington Post, the Surface Studio, one of Microsoft's new products, is really just a super-sized version of the Surface Books product that Microsoft has been selling for years. But if you've ever watched science fiction movies like Minority Report-- where Tom Cruise seems to operate pictures and data hanging on mid-air by touching them, spreading his fingers to increase on details, and sending files and information sliding from one folder to another with a click of the finger, you can see how Microsoft is trying to show the same experience.

    Meanwhile, apple's new products were almost like some fine promotions for its Apple TV. They boast that the new Macbook Pro has a smaller size and more functions, and a new touch screen bar on laptop keyboards where function keys used to be.

    So what's going on? In many ways, Apple is focusing on attracting the average consumers who have been attracted by Microsoft. And Microsoft is focusing on targeting the high-end professionals Apple has historically been associated with. You can even see this is the companies' ad campaigns: Microsoft's ads stress imagination and creativity, while Apple's commercial chief performance and convenience of its Macbooks.

    So Apple is trying to control the world of devices and laptops from the top down, starting with the high-end market and moving on to appeal to a broader base of consumers. Microsoft, having already strengthened itself within the bigger low-end market, is now attempting the opposite with a bottom-up strategy. Will they succeed? Time will tell...

    With the possible exception of equal rights, perhaps the most controversial issue across the United States today is the death penalty. Many argue that it is an effective deterrent (威慑) to murder, while others maintain there is no convincing evidence that the death penalty reduces the number of murders.

    The principal argument advanced by those opposed to the death penalty, basically, is that it is cruel and inhuman punishment, which is the mark of a brutal society, and finally that it is of questionable effectiveness as a deterrent to crime anyway.

    In our opinion, the death penalty is a necessary evil. Throughout recorded history there have always been those extreme individuals in every society who were capable of terribly violent crimes such as murder. But some are more extreme than others.

    For example, it is one thing to take the life of another in a fit of blind rage, but quite another to coldly plot and carry out the murder of one or more people in the style of a butcher. Thus, murder, like all other crimes, is a matter of relative degree. While it could be argued with some conviction that the criminal in the first instance should be merely separated from society, such should not be the fate of the latter type murderer.

    The value of the death penalty as a deterrent to crime may be open to debate. But the overwhelming majority of citizens believe that the death penalty protects them. Their belief is strengthened by evidence which shows that the death penalty deters murder. For example, from 1954 to 1963, when the death penalty was consistently imposed in California, the murder rate remained between three and four murders for each 100,000 population. Since 1964 the death penalty has been carried out only once, and the murder rate has risen to 10.4 murders for each 100,000 population. The sharp climb in the state's murder rate, which began when executions stopped, is no coincidence. It is convincing evidence that the death penalty does deter many murderers. If the bill reestablishing the death penalty is banned, innocent people will be murdered—some whose lives may have been saved if the death penalty were in effect. This is literally a life or death matter. The lives of thousands of innocent people must be protected.