birth rate, the number of babies born in a place, at risk, in danger, run out of, have no more of something, research into ..., study something to learn more about it, cause sth, make something happen, invest in, put money into something, predict sth, say what will happen in the future, explore sth, learn more about something, cure for ..., something that makes an illness go away, climate change, long-term changes in Earth’s weather and temperature, be affected, be changed or influenced by something, energy sources, places or things we get energy from, fall, go down, increase, go up or become bigger, steadily, slowly and regularly, dramatically, very suddenly or strongly.

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