Earth Day 2015: 10 quotes that inspire activism and conservation

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Young Indian schoolchildren participate in a tree planting programme on the occasion of Earth Day in Kolkata on April 22, 2015. Earth Day is observed each April 22, during which events are held worldwide to demonstrate support for environmental protection. AFP PHOTO / Dibyangshu SARKAR
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Biologist Carlos Galvis holds a Golden Frog (Phyllobates terribilis), the most venomous in the world, is photographed in a laboratory at the zoo in Cali, Colombia, on April 21, 2015. The zoo of Cali, has the largest amphibians laboratory in the country, where they perform studies on the conservation of some amphibian species in danger of extinction. Colombia has the second largest biodiversity in the world. Activists across the globe will celebrate Earth Day on April 22 with events aimed at bringing awareness of environmental concerns. AFP PHOTO/LUIS ROBAYO
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Locals play on the algae-covered beach and swim in the ocean near Grand Bassam on April 18, 2015. Once an important port, economic, and judicial center of the Ivory Coast, The Historic Town of Grand Bassam is the first capital of the country to be added to UNESCO's World Heritage List. AFP PHOTO / SIA KAMBOU
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Palestinian Hussein Al-Najjar, 14-years-old, searches through a pile of trash for recyclable waste and other items in hope to be able to sell them, at a garbage dump in Rafah, in the southern Gaza Strip on April 16, 2015. AFP PHOTO / SAID KHATIB
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Nepali porter Milan Rai, 14, makes his way up a rocky path high above the north-eastern town of Namche Bazar on his way to making a delivery to a hotel in a nearby town at higher elevation on April 18, 2015. Today, Rai was carrying sacks of flour but he and others like him ferry goods between towns for a living. Rai said he makes around 3,000 Nepalese Rupees (30 USD) a month. Namche Bazar, seen in the background, is a usual stop for trekkers and climbers heading to the upper reaches of the Kumbhu region, which is home to Mount Everest. AFP PHOTO/ROBERTO SCHMIDT
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A fisherman throws his net into the Ebrie Lagoon in Grand Bassam on April 21, 2015. Once an important port, economic, and judicial center of the Ivory Coast, The Historic Town of Grand Bassam is the first capital of the country to be added to UNESCO's World Heritage List. AFP PHOTO / SIA KAMBOU
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Indian school girls holds placards and a globe during an awareness campaign to mark Earth Day at a school in Amritsar on April 22, 2015. Earth Day is observed each April 22, during which events are held worldwide to demonstrate support for environmental protection. AFP PHOTO/NARINDER NANU
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POINT REYES STATION, CA - APRIL 19: Tule Elk graze on grass in a field at Point Reyes National Seashore Elk Preserve on April 19, 2015 in Point Reyes Station, California. As California enters its fourth year of severe drought, the dry conditions are being blamed for the deaths of nearly 250 Tule Elk in the past two years at the 2,600-acre Point Reyes National Seashore Elk Preserve. The heard has dropped from 540 to 286 this past year. The National Park Service is considering bringing in water as ponds and grasses in the preserve dry up. Justin Sullivan/Getty Images/AFP