It seems I have said that before.

　　I'm Carl Azuz for commercial-free CNN STUDENT NEWS.

　　It is month and one day until the official end of summer in the northern hemisphere.

　　But scientists say, worldwide, July was the warmest month since 1880

　　when researchers started reporting global temperatures.

　　It's according to U.S. and Japanese government agencies.

　　How much warmer?

　　In Fahrenheit, scientists say July 2015 was 0.36 of 1 degree warmer

　　than the previous record set in July 2011.

　　This was a worldwide measurement.

　　Summer in the U.S. alone had pretty normal temperatures.

　　CHAD MYERS, AMS METEOROLOGIST: Well, it's now official --

　　July 2015 is the warmest month on record.

　　The biggest driver of this I think is El Nino.

　　It's always warm when we have an El Nino year.

　　It's that warm water that sets off the Pacific coast of South America, getting blown across the Pacific.

　　It's warm pool of air and it keeps the atmosphere warmer because it is so warm.

　　We also have greenhouse gases, the highest concentrations that we've ever measured.

　　So, where do these measurements come from? Thermometers on land.

　　Satellite measurements, looking down at the Earth measuring temperatures remotely.

　　And also, ships at seas taking measurements as they cross the globe.

　　Now, there are smaller circulations across the globe, too.

　　There are patterns across the Pacific Northwest.

　　This thing called "The Blob" out there,

　　an area of warm water that has really drastically change

　　the climate for Seattle and Portland and for most of California in a very big drought.

　　All of this part of the warmest month on record.

　　AZUZ: It's a mystery that started on March 8th of 2014.

　　After taking off from Kuala Lumpur, Malaysia, heading to Beijing, China,

　　Malaysia Airlines Flight 370 vanished with 239 people onboard.

　　Investigators believe the plane dramatically changed course during its flight

　　and eventually went down somewhere in the Indian Ocean, far off the western coast of Australia.

　　A possible clue emerged late last month on Reunion Island.

　　This is a French territory located east of Madagascar,

　　in the western Indian Ocean, where debris from the plane might have drifted.

　　A beach-cleaning crew found part of an airplane wing.

　　Malaysian officials say it's from Flight 370, but it's still being investigated.

　　And investigators still don't know what happened to the plane or where any other wreckage might be.

　　Veteran oceanographers tell CNN this could be the new front line of the search for MH370,

　　which is why search teams are now looking off not only Reunion Island but nearby Madagascar,

　　the Seychelles Islands, Mauritius, Mozambique, and off the east coast of South Africa.

　　The reason? A powerful stream of currents circulating in the Indian Ocean, called a gyre.

　　It is a permanent circulation pattern in the Indian Ocean

　　that runs counter clockwise starts off the coast of Australia

　　and the west of Australian current,

　　moves north and then picks up in the southern equatorial current,

　　moving east to west across the Indian Ocean basin before it turns south and then returns.

　　TODD: Former U.S. Navy oceanographer, Van Gurley,

　　says other parts of MH370 that could be found,

　　seats or other objects with foam inserts or closed air pockets,

　　characters which could cause something to float.

　　Experts say that may be why this apparent piece made it to Reunion Island.

　　But Gurley says if the missing plane is in the area off Australia where scientists think it went down,

　　objects could also be found in the other direction, on the other side of Australia.

　　GURLEY: Looking at the overall current patterns, at the end of 18 to 24 months,

　　the red area, some debris could end up over here where we're talking now, but others could end up down here.