has been falling steadily/has increased dramatically - The global birth rate, of running out of oil and gas/of getting more cancer - These days we are at risk, into identifying genes/into new sources of energy. - Recently, there's been a lot of research, cancer cells to grow/climate change. - Scientists don't know what causes, in developing solar power/in finding a cure for Alzheimer's. - Our country has invested billions, future earthquakes/ exactly how we will be affected by climate change.  - We still can't predict, the bottom of the oceans/space - We should invest more in exploring,

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