To fully use up our limited resources without wasting them.
"To fully use up"＝「使い切る」
"our limited resources"＝「私達の限られた資源を」
"without wasting them"＝「それらを無駄にしないで」
Sentence in context:
"There is still so much edible food here. Let's not waste them, since our resources are limited."
アメリカ合衆国 
