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Science says humans are the driving force behind climate change. But we have to go back centuries to get an idea of how we got to where we are today.In the 1600s, people started using coal for fuel more often than wood. It was more widely available and produced more energy.The industrial revolution was a turning point. That’s when America started burning more fossil fuels for energy.By the early 1800s, people were using high-pressure boilers to fuel coal-powered engines. That included trains, steamboats, and ships.The first theory of human-caused climate change came about in 1838. A physicist proposed that water vapor and carbon dioxide could trap heat in the earth's atmosphere.Then, in 1876, a Russian scientist observed that - since the industrial revolution - Siberian glaciers started melting.Scientists say much of that water ended up in the ocean and raised sea levels.Sea levels are between five and eight inches higher today than they were in 1900.Some climate change critics argue temperatures are going down in some places.Scientists say that's somewhat true but that, overall, earth's temperatures are on the rise.Critics also argue humans aren't behind climate change.Scientists say there's a direct correlation between human carbon emissions and rising temperatures.Some scientists believe our "right now" culture will make the crisis worse. They say things like same-day delivery and frequent air travel could all put more carbon into the atmosphere. That the carbon traps heat that then warms the earth. 1539

Projects to reduce the risk of wildfires and protect water sources in the U.S. West have created jobs and infused more money in local economies, researchers say, and they were funded by a partnership between governments and businesses that has become a model in other countries.A team from the U.S. Geological Survey reviewed work being done in several counties along the New Mexico-Colorado border that make up the watershed of one of North America’s longest rivers, the Rio Grande. The review shows how public-private partnerships could become a critical component for safeguarding the land and benefiting the economy amid the threat of federal funding cuts and worsening wildfires brought on by climate change.The 729

TAMPA, Florida — A sperm bank is promising to change its policy after WFTS television station uncovered one of its donors fathered more than 50 children across the U.S. and around the world — including some kids in the Tampa Bay area.Atlanta-based Xytex Cryo International did nothing illegal when it used the same donor to help birth at least 52 children. That’s because when it comes to sperm donations, U.S. regulations are few and there are no limits set by the government.Xytex wouldn’t speak on camera but told 529

Southwest Airlines lost million because of the government shutdown, the company said Wednesday.That's far more than its original estimate of to million in losses, and it adds to a litany of recent problems for the airline.On Tuesday, maintenance problems forced the airline to cancel 191 flights, or about 4% of its operation, according to data from FlightAware. The airline said more than 40 planes had maintenance issues, which is twice the daily average.The mechanical issues are bad enough that the airline has canceled vacations for mechanics and is operating with "all hands on-deck." As of 9:45 am ET on Wednesday it had already canceled 404 flights for Wednesday and 23 for Thursday.Besides the mechanical issues and the revenue hit, the 771

Six people are dead after two floatplanes carrying cruise ship passengers collided in flight near Ketchikan, Alaska, on Monday, the US Coast Guard said.The Alaska State Troopers identified the deceased passengers as Simon Bodie, 56, of Tempe, New South Wales, Australia; Cassandra Webb, 62, of St. Louis, Missouri; Ryan Wilk, 39, of Utah; Louis Botha, 46, of San Diego, California; and Elsa Wilk, 37, of Richmond, British Columbia, Canada. Randy Sullivan, a 46-year-old pilot from Ketchikan also died.The Coast Guard, which is leading the investigation, said 10 people were rescued following the collision between a Beaver floatplane and an Otter floatplane.The Coast Guard had initially announced the death of four people on Monday, as authorities searched for two others who were missing.The bodies of the missing individuals were located Tuesday night, raising the death toll to six, the Coast Guard said.Floatplanes are aircrafts with pontoons or floats that allow them to land on water.The passengers on both planes were guests on a Princess Cruises ship -- the Royal Princess -- which is on a seven-day trip. There were 14 Americans, one Canadian and one Australian on board the two planes, according to the Coast Guard.The Royal Princess' voyage originated in Vancouver, British Columbia, over the weekend and is scheduled to end Saturday in Anchorage, Alaska, the company said. Part of the voyage, the company's website said, included "scenic glacier viewing" with stops at Juneau, Ketchikan and Skagway.The passengers on each planeThe two planes collided around 1 p.m. (5 p.m. ET). The Otter plane, operated by Taquan Air, a regional airline based in Ketchikan, was flying a shore excursion with 10 passengers and a pilot aboard. One of those passengers died, Princess Cruises said.Ten people from the aircraft were transported to the hospital. As of Tuesday night, three had been discharged. A 67-year-old man remains in serious condition, but is improving, a hospital spokeswoman said.The second plane was carrying four passengers and a pilot on an independent tour, the cruise line said. It was operated by Mountain Air Service, NTSB board member Jennifer Homendy said. Everyone aboard that plane was killed, according to the Coast Guard.The search for the two missing people The Coast Guard, Ketchikan Volunteer Rescue Squad, partner agencies and good Samaritans searched the shoreline and forested areas near the crash site for 27 hours, according to the Coast Guard.The "exhaustive search and rescue efforts" covered 93 square nautical miles, the Coast Guard said."We have been in regular contact with the family members throughout our search efforts," said Capt. Stephen White, Sector Juneau commander. "This is not the outcome we hoped for and extend our deepest sympathies during this very difficult time."Taquan Air released a statement saying it was "in the midst of an active crisis response, and our focus is on assisting these passengers, the pilot, our staff, their families and loved ones, and first responders.""Taquan Air has suspended all scheduled flights and is cooperating fully with the National Transportation Safety Board (NTSB), the Federal Aviation Administration (FAA) and other authorities to examine every aspect of this event," the company's statement said.No flight data recorders on either aircraftA 14-member NTSB team of investigators will try to determine what caused the crash, Homendy said during a news conference Tuesday.Eleven of them were on the scene Tuesday night with the other three on the way.Investigators will want to talk with surviving passengers, the pilot of the Taquan airplane, other employees of the air operators as well as other pilots and witnesses that were in the area at the time, Homendy said.They will also be requesting information from parties involved and looking at pilot log books, the training and qualifications of the pilots, any possible medical issues, whether flight plans were filed with the companies or FAA, maintenance records for the aircrafts as well as each company's operating procedures and whether those procedures were followed, she said.There were no cockpit voice recorders or flight data recorders on either of the two planes, Homendy also said during the news conference. Neither plane was required by regulation to have such recorders, she said.The two planes collided between 3,200 and 3,300 feet on the west side of George Inlet, according to Homendy.The wreckage is expected to be recovered Wednesday, Homendy said, and an NTSB structural expert will try to figure out how the two planes came together. 4617