fossil fuels, global warming, greenhouse gases, ice caps, rainforest, renewable energy, sea level, surface temperature, heat up, to make something hot or warm:, give off, to produce heat, light, a smell, or a gas:, cut down, to make a tree or other plant fall to the ground by cutting it near the bottom:, die out, to become less common and finally stop existing:, run out, to finish, use, or sell all of something, so that there is none left:, carry on, to continue doing something, or to cause something to continue:, put off, to decide or arrange to delay an event or activity until a later time or date:, give up, to stop owning, using, or claiming something:, look after, to take care of or be in charge of someone or something:, come up with, to suggest or think of an idea or plan:, close down, If a business or organization closes down or someone closes it down, it stops operating:, rely on, to need a particular thing or the help and support of someone or something in order to continue, to work correctly, or to succeed:

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