Nurturing in Swahili is Kulea or Kutunza meaning to care for and encourage the growth or development of something or someone. Other colleagues may suggest this to be Malezi but I think given the context of the given sentence the nurture verb of lea/ kulea takes more play than the nurture noun of malezi.

Nature in Swahili is Maumbile meaning the phenomena of the physical world, the natural world our beloved mother earth. Other colleagues may want to refer to nature as Asili or Ulimwengu or Desturi or Mazingira and I believe all these are correct depending with the context!