birth rate - the number of babies born in a year, global food crisis - a situation in which many people around the world cannot get enough to eat, indoor farms - places inside buildings where crops are grown, invested (in research) - spent money or resources in order to get knowledge or results, develop by chance - to form randomly, without being planned, solar power - electricity or heat produced by sunlight, divide water into oxygen and hydrogen - use a process (electrolysis) to separate H₂O into its component gases, clean fuel - a source of energy that does not pollute when used, e.g. hydrogen,

Global problems

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