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The polar bear is under serious threat of becoming extinct because of global warming.

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the Bush administration is coming round to the threat of climate change
Meaning accepting the idea at last
Examples Councillors and officials have come round to the view that this kind of investment is an essential ingredient in the city's revival.
Particle round suggests moving from one position to the other

 

The ice is breaking up earlier
Meaning chunks of ice are separating earlier
Examples As the ice breaks up in the spring, the whales move north again feeding near river mouths and offshore.
Particle up is used for emphasis in this verb

 

build up fat reserves
Meaning gradually accumulate fat reserves
Examples I still feel very weak after my illness. I think I need some vitamins to help me build my strength up.
Particle up means more