drought, If it doesn't rain for many months, the land becomes very dry and a ____can destroy all the crops, recycle, We must try to ___paper, plastic, and glass so they can be used again to make new products, melt, Scientists are worried that the polar ice caps will ___ because the Earth is getting warmer, oil spill, An___ in the ocean can be deadly for sea birds and fish because the thick liquid covers their feathers and scales, ozone layer, The ___ protects the Earth from the sun's dangerous ultraviolet (UV) radiation, flood, When it rains too much in a short time, the river can rise and cause a ___that damages homes, greenhouse effect, Too much CO2 in the atmosphere increases the ___, which traps heat and makes the planet hotter, save, We should try to ___energy by turning off the lights when we leave a room, pollution, Air ___in big cities is often caused by smoke from factories and exhaust from cars, nuclear disaster, A ___ is extremely dangerous because it can release radiation that stays in the environment for many years, waste, Many people use too much plastic and then throw it away, which creates a lot of unnecessary ____, global warming, Most experts agree that ___ is causing extreme weather patterns all over the world

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