a cub - a baby bear, hibernate - to sleep through the winter, so far - up to now, a den - a bear's home, shot - hit by a bullet from a gun, blind - can't see, a nature reserve - a place where animals are protected, an orphan - a child with no parents, an orphanage - a place where orphans are looked after, extinct - they have all died, fur - a bear's hair, a donation - money that you give to help, drought - when there is no rain for a long time, power stations - these produce electricity, climate change - the Earth is getting hotter, the ice caps - the ice in the Arctic and Antarctic, CO2 - carbon dioxide, pollution - harmful chemicals in the air or water , greenhouse gases - gases that trap the sun's heat, fossil fuels - coal, oil and gas,

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