The climate getting worse means that many years, their crops won't grow: there will be too much rain, not enough rain; things will change in ways their fragile environment simply can't support.
Que el clima empitjori vol dir que les seves collites no creixeran durant anys. Hi haurà massa pluja, massa poca pluja. Les coses canviaran de maneres que el seu fràgil medi ambient simplement no pot suportar.