Beach litter: two minutes can make the difference | Photo: Martin Dorey

Martin Dorey, a British surfer, has founded "2 Minute Beach Clean", a beach cleanup initiative that invites everyone to spend 120 seconds picking up a few bits of marine litter.

It's easy, it doesn't take much time, and it can change the world's beaches. In the last years, after each surf session, Martin Dorey has been picking up beach litter. But it wasn't enough.

"I was getting disheartened that what little I was doing on my own was making so little impact in the face of the problem. I figured that if all of us did just a bit we could make a bigger difference between us," explains Dorey.

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Rhinoceros: rare and mellow

Jordy Smith, Kelly Slater and Martin Potter have visited the Chipembere Rhino Foundation to help raise awareness about the conservation of rhinos, in South Africa.

Pro surfers want to help rhinoceros. In the first semester of 2014, more than 500 rhinos have been killed in South Africa because of their horns, which are falsely believed to have healing and medicinal properties.

"I was astounded by the number of the rhinos that are killed each year. There are only about 25,000 rhinos left in the world, and last year alone over 1,000 were killed in South Africa," explains Kelly Slater.

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Baltimore Water Wheel: efficient and green

Baltimore resident John Kellett developed a big water wheel that collects floating trash from the city's Inner Harbor.

The creative idea is a complete success. Plastic cups, cigarette butts, wood log, bags, and all sorts of trash are being easily removed from Baltimore's Inner Harbor waters thanks to a simple metal wheel.

"I started out thinking, 'Maybe we could bale it like a hay baler.' And then I said, 'Well, that's not necessary; maybe we can make it even simpler - we can just use the power of the runoff that brings it to collect it,'" explains John Kellett, the inventor of the mechanism.

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