Celebrating a turning point on our planet. It took two decades, but now, a historic agreement on Climate Change signed by nearly every nation in the world. The bang of a gavel cementing the deal, a limit on Greenhouse Gas emissions that could reduce the effects of Climate Change. President obama offering his praise a short time ago, saying the agreement offers the best chance to save the one planet we have. But there are protesters weighing in, too. Criticizing that deal for not going far enough. What is certain tonight, the affect of this agreement will be felt for generations. Abcs Alex Marquardt starts us off tonight. Reporter a standing ovation and tears tonight, as almost every country in the world agreed to the landmark deal aimed at preventing catastrophic Climate Change. Tonight, the white house called it the most ambitious Climate Change agreement in history. This agreement represents the needs to solve the climate crisis. Reporter 195 countries signing onto the agreement. The culmination of two decades of negotiations that had failed, until now. In the end, two weeks of intense talks outside paris, including several allnighters for the delegates, led to the deal that goes into effect in 2020. Whose goal is limiting the warming of the earth to less than 3. 6 degrees fahrenheit. Each country came up with a plan to reduce their Greenhouse Gas emissions and will be required to publicly report them. Eve reached an agreement here that is the strongest, most ambitious global Climate Change agreement ever negotiated. Reporter but much of the agreement is voluntary and not legally binding. Developing countries, like china, which has seen horrendous smog in recent weeks, wont be required to report as much about their emissions, and the deal doesnt have a way to punish countries that dont live up to the agreement. Climate scientists agree that Global Warming wont end because saying it falls short, its being celebrated around the world as a momentous breakthrough. Cecilia . Alex, thank you. And we want to turn now to our other top story, to california. An arrest in a firebombing at a mosque there. And investigators are calling it a possible hate crime. Abcs aditi roy reporting in from the scene tonight. Reporter inside the blownout door of this Southern California mosque, the charred lobby, barely recognizable, after a fire authorities believe was arson, and tonight, authorities have arrested 23yearold carl dial for suspicions of committing a hate crime. Commercial structure fire with battalion 6a on scene. Reporter the blaze erupting just past noon yesterday, after eye witnesses say a firebomb was hurled at the mosques front door. Theres a huge plume of smoke. Mushroom cloud. Reporter several inside managing to escape as the lobby caught fire. Worshippers later moved prayers to the sidewalk. When you look at this, what goes sadness, actually. Its a family place. Its a social place for us. We just have to work on rebuilding it again. Reporter the Islamic Society of the Coachella Valley mosque is just 75 miles from San Bernardino. The fire, one of several incidents that officials are investigating, as possible backlashes to those terrorist shootings. In all, there have been three times as many cases of vandalism and harassment at mosques this year than last. Says the council on American Islamic relations. In philadelphia, Surveillance Video of a pigs head thrown at a mosque. Threatening voicemails left at a mosque in st. Louis. Come my way and ill [ bleep ] you all. Cut your [ bleep ] head off. Reporter are you worried about other attacks happening . We are concerned about other attacks. The answer is yes. Reporter the acting imam here tells me it is unclear how long it will take them to rebuild. Meantime, they are doubling security and reassuring families here that they are safe. Devastating. Aditi, thank you. Not too far from where aditi is reporting tonight, the desperate hunt for clues in that terror attack in San Bernardino. Fbi divers recovering objects from the bottom of this lakeke no word yet on whether they are linked to the husband and wife killers. And a childhood friend of one of the shooters being questioned again today, police saying he bought their most deadly weapons. All of this as more victims are are laid to rest. Abcs Kayna Whitworth reporting in from San Bernardino tonight. Reporter for the third day, searchers combing through this muddy lake in San Bernardino. The fbi telling abc news, divers have pulled items from the water and are now analyzing them for any connection to syed farook and tashfeen malik. Investigators are still looking for the couples missing hard drive. Tonight, far friend, enrique marquez, who bought the two rifles used in the attack, now in his sixth day of questioning by the fbi. He is probably sitting as fbi hotel. So, he continues to talk and describe whatever he knows about syed and the female that was, you know, part of the attack. Reporter marquez hasnt been charged with a crime, and says he knew nothing about the plans for the San Bernardino attack. But what he has told investigators is that farook had planned an attack in 2012, but got cold feet. Nick rodriguez, who knew marquez from a local bar, said he remembered one chat back in 2013, but shrugged it off as drunk banter. He would just talk about how there are so many sleeper cells and when its going to happen, its going to be big. Reporter rodriguez believes marquez is p ptly responsible, no matter what he knew about the attack ten days ago. He turned his back on america. Like i said, innocent people are dead. Families broken up this holiday. People are missing. Theres presents underneath the tree that are never going to be opened. Reporter today, those families saying goodbye to johnson, who saved the life of his coworker, denise perazza, by shielding her from the bullets. His last words to her . I got you. Hes always about taking care of those who cant take care of themselves. Reporter shannons brother described him as fearless today. He was certainly that in the face of terror. And now his name is inscribed on this wall of remembrance, along with the 13 other victims. Cecilia . Fearless indeed. Kayna, thank you. We want to turn now to poll sicks. Donald trumps in some unfamiliar territory, second place. A new poll out tonight showing him ten points behind ted cruz in iowa, and with a big Republican Debate just days away, the gloves are already coming off. Abcs mary bruce reporting in from the white house. Reporter tonight, the bromance between donald trump and ted cruz is on the rocks. Its not a contest the two of us, just so we understand. Reporter as cruz gains ground, trump for the first time is taking aim at the texas senator, targeting his faith. Cuba. Reporter in iowa, trump jabbed cruz for opposing popular ethanol subsidies. If ted cruz is against ethanol, how does he win in iowa . Because thats very antiiowa. Reporter this iowa farmer tells us its trump or bust. Anybody else gets in, its the same old garbage. Nothing gets done. Reporter you think hes the only one . I think hes the one that can get it done, yeah. Reporter but trump also has kind words for his chief rival, saying cruz would have a role to play in a his administration. We would certainly have things in mind for ted, to be honest with you. Reporter in South Carolina today, trump came under fire for his call to ban muslims entering the u. S. But he stands by his controversial proposal. We dont want people coming in and knocking down World Trade Centers and having what happened last week. Reporter and trump is already responding, blasting that new poll that shows cruz with a tenpoint lead. Trump just tweeting, dont he sails s says its biased. Cecilia . Mary bruce at the white house tonight. Thank you. And there will be a big democratic debate, too, right here on abc. Join david muir and Martha Raddatz for the New Hampshire democratic debate. Your voice, your vote. One week from tonight, saturday, december 19th, 8 00 7 00 central. We turn now to that extreme weather this weekend. At least two reported tornadoes so far in east texas. Take a look at this. Homes damaged this afternoon in lindale. This neighborhood in shambles. And now, murlgeteorologist Indra Peterson is with us. Welcome to abc news. But we do have tough weather to talk about a forecast that stretches late into this evening. Reporter thats the concern as we go to the overnight hours. We have severe thunderstorm watches up right now. Portions of oklahoma and middle sections of texas, going to be watching for isolated tornadoes and a lot of strong winds, large hail and damaging winds out there. Not to mention rainfall. Oklahoma city, dallas, even austin could be seeing as much as four if not five inches of rain. Were talking about that threat as they get hit there, here on the east coast, it does not feel like a day in december. You brought some warm weather with you. How long is this going to last for us . Reporter as i said, i feel very guilty, as they are suffering in the middle of the country. But temperatures, 25 degrees above normal. Doesnt feel like december. Were talking about temperatures that should be in the 30s in chicago, they are looking for 60s. D. C. In the 40s, almost near 70 degrees tomorrow. I dont think theres many complaints in the eastern half of the country right now. Keep the weather. Thank you for joining us. Nice to see you. And we do turn now to hundreds of parents in californias bay area. Worried about what their newborn babies might have been exposed to at the hospital. What one nurse may have spread to those babies, and their moms, too. Heres abcs ron claiborne. Reporter the news was stunning. 350 newborn babies at this san jose, california, hospital, possibly exposed to a nurse who tested positive for tuberculosis. Those infants will now undergo daily treatment with antibiotics for the next six to nine months as a precaution. Be infected and start them on medications, until we can show for sure that theyre not infected. Reporter in addition to the babies, 368 mothers and 338 hospital employees, who came into contact with the nurse between september and november, will be monitored, but not treated unless they test positive for tb. According to officials at santa clara clara, the nurses annual tb checkup in september was negative. But in november, she saw her doctor for an unspecified complaint. And that doctor ordered a chest xray, which led to the diagnosis. The nurse has been placed on paid leave of absence. Tb is transmitted through the air, by a person coughing or sneezing. She was not coughing up tuberculosis during the period of time that she was working. Reporter but the hospital decided to act just the same, and local Health Officials and the hospital say they have identified everyone who may have been exposed to the disease. And theyre working through the weekend to contact them and and i should add, cecilia, that doctors we spoke to said the antibiotics the newborns are getting, they are considered very safe and side effects very rare. Tough for that hospital, but really scary for those brand new parents. Reporter really is. Something else scary, if you havent finished your christmas shopping, i havent. A warning tonight for all us procrastinators. Before you click your way to checkout, heres abcs Gloria Riviera with the holiday scam causing some big holiday headaches. Reporter this holiday season, beware of scam artists online, waiting for you. Shopping for her daughter, mindy hayes clicked on an ad in her facebook feed for ugg boots, over 80 off. I was like, oh, great deal. Reporter too great. Those boots never arrived. The online retailer apparently a fake. When i got my confirmation email, it just didnt look legitimate. Reporter mindy, an avid online shopper, who works in i. T. , was out 83. Experts warn it could have been worse. More money or even her identity. Family and friends in danger. Reporter all of that can happen with just one click . Absolutely. Reporter so, what should you be looking for . Safe sites have an s with a lock in the url. Fake sites often have typos and grammatical errors. Real online businesses have extensive privacy policies. Facebook quickly investigated, telling abc news it has blocked this website from placing future ads. As for mindy hayes, shes working on getting her money back. Its hard to know, really, who you can and cant buy from online. Reporter Gloria Riviera, abc news, washington. We still have much more ahead on world news tonight. Coming up, it was once known as americas most notorious store for selling guns used in crimes. Tonight, it is being forced to pay big bucks for the guns it sold. The settlement over the landmark ruling that could change americas gun debate. And, this, the hunt for more than 80,000 worth of stolen jewels. How some nearby College Students might recognize that face. This is claira. To prove to you that aleve is the better choice for her shes agreed to give it up. Thats today . Well be with her all day to see how it goes. After the deliveries, i was ok. Now the ciabatta is done and the pain is starting again. More pills . Seriously . Seriously. All these stops to take more pills can be a pain. Can i get my aleve back . For my pain, i want my aleve. Get all day minor arthritis pain relief with an easy open cap. At ally bank no branches equals great rates. Its a fact. Kind of like ordering wine equals pretending to know wine. With my moderate to severe ulcerative colitis, the possibility of a flare was almost always on my mind. Thinking about what to avoid, where to go. And how to deal with my uc. To me, that was normal. Until i talked to my doctor. She told me that humira helps people like me get uc under control and keep it under control when certain medications havent worked well enough. Humira can lower your ability to fight infections, including tuberculosis. Serious, sometimes fatal infections and cancers, including lymphoma, have happened; as have blood, liver, and nervous system problems, serious allergic reactions, and new or worsening heart failure. Before treatment, get tested for tb. Tell your doctor if youve been to areas where certain fungal infections are common, and if youve had tb, hepatitis b, are prone to infections, or have flulike symptoms or sores. Dont start humira if you have an infection. Raise your expectations. Ask your gastroenterologist about humira. With humira, control is possible. Theres something out there. That can be serious, its whooping cough, and people can spread it without knowing it. Understand the danger your new grandchild faces. Talk to your doctor or pharmacist about a whooping cough vaccination today. Next, police in ohio say they have their man. And grabbed more than 80,000 in sapphires from a Museum Display case. And the suspect . He has a day job at a nearby college campus. Heres abcs marci gonzalez. Reporter tonight, Cleveland Police searching for more than 80,000 worth of jewels. Stolen, they say, by this popular parttime University Lab instructor. In this Surveillance Video, you see a man Police Identified as hans wrage, casually stroll into the Cleveland Natural History Museum last week. 30 minutes later, investigators say, there he is slipping out through a service door, getting away, according to this police the shattered display case, missing seven valuable sapphires. As long as ive been down there, this is the first time its happened, that any of these museums down here got hit like this. Reporter the 36yearold parttime lab tech and physics teacher arrested yesterday and put on administrative leave by john carroll university. Im surprised. I dont see that. Kind of a quiet guy. Does not seem like he would steal stuff, i dont know. Especially 81,000 worth of jewelry. Reporter Police Telling abc news, wrage is still being questioned tonight, as detectives try to figure out where the jewels ended up. Marci gonzalez, abc news, new york. Still ahead on world news tonight, the photo that had all of us here cringing today. 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The landmark ruling, the first of its kind, against a gun store. Several other similar lawsuits are still in the works. And next, that terrifying close call on a california look at this. The massive steel beam falling off a truck and slicing right through the windshield of this bmw, right into the drivers seat. Amazingly, the driver of that car escaped with just a small scratch on his arm. One firefighter on the scene says that man needs to buy a lotto ticket immediately. I would say buy at least two. And it is a special day for one of musics biggest legends. Much more than this i did it my way yeah, today marks what would have been the 100th birthday of old blue eyes himself. Nearly 20 years after his death, Frank Sinatra remains one of the bestselling artists of all time. More than 150 million records worldwide. 11 grammys, two oscars, three stars on the hollywood walk of fame, the president ial medal of freedom, the congressional gold medal and he is, of course, we salute Frank Sinatra. When we come back, tis the season for gift giving. You Better Believe it. Do you believe in santa claus . I dont know. Believe it is right. The secret santa behind all those smiles on so many faces tonight. Automated voice to file a claim, please state your name. Ca wilson. Thank you. Can you hold on . Hold on for one more day really . Hey, i know theres pain. Why do you lock yourself up in these chains . This would be so easy if you had progressive. Our mobile app would let you file a claim and help you find one of our Service Centers where we manage the entire repair process. Things will go your way if you hold on. [ sighs ] someday somebodys gonna make you wanna turn around and say goodbye. Say goodbye no, you just made it weird. I accept im not 22. 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Ive never had anything like that happen to me. Reporter one of a kind, hardly, because, hop east, to bellingham, massachusetts. Same thing, toys r us. Debbie pendlebury goes in to pay her bill and i honestly was stunned. Reporter go west again, and the Kansas City Star followed a man handing out 100 bills. Thats for you, buddy. Wow. You can cry. I cry all the time. Thank you reporter and onward, a Salvation Army kettle in billlerica, massachasetts, a diamond ring turns up there, valued at 3,500. Another one in minneapolis gets a check for half a million but as in epping, New Hampshire, scene of yet another layaway payoff this week, benefiting robin ayers and company, when you dont know whom to thank, and thats on purpose, this is what you say merry christmas. Merry christmas, you say . He said merry christmas. Reporter john donvan, abc news, washington. Gma and this week in the morning. We will see you right back here tomorrow night. Im cecilia vega in new york. Good night