Unmanned flying vehicles are growing in popularity all over the world. The technology is developing quickly with drones able to fly further and carry ever heavier payloads. But will the skies above our heads be safe? CNBC’s David Reid investigates. ----- Subscribe to us on YouTube: cnb.cx/2wuoARM Subscribe to CNBC International TV on YouTube: cnb.cx/2NGytpz Like our Facebook page: www.facebook.com/cnbcinternational Follow us on Instagram: www.instagram.com/cnbcinternational/ Follow us on Twitter: twitter.com/CNBCi

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